{"id":4131,"date":"2016-05-06T11:49:00","date_gmt":"2016-05-06T11:49:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/"},"modified":"2018-06-07T16:57:35","modified_gmt":"2018-06-07T11:27:35","slug":"ncert-solutions-for-class-9-science-structure-of-the-atom-part-2","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/","title":{"rendered":"NCERT Solutions for Class 9 Science Structure of the Atom part 2"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#NCERT_Class_9_Science_Chapter_wise_Solutions\" >NCERT Class 9 Science Chapter wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#NCERT_Solutions_for_Class_9_Science_Structure_of_the_Atom_part_2\" >NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#1Compare_the_properties_of_electrons_protons_and_neutrons\" >1.Compare the properties of electrons, protons and neutrons.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#2_What_are_the_limitations_of_JJ_Thomsons_model_of_the_atom\" >2. What are the limitations of J.J. Thomson\u2019s model of the atom?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#3_What_are_the_limitations_of_Rutherfords_model_of_the_atom\" >3. What are the limitations of Rutherford\u2019s model of the atom?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#4_Describe_Bohrs_model_of_the_atom\" >4. Describe Bohr\u2019s model of the atom.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#5_Compare_all_the_proposed_models_of_an_atom_given_in_this_chapter\" >5. Compare all the proposed models of an atom given in this chapter.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#6_Summarise_the_rules_for_writing_of_distribution_of_electrons_in_various_shells_for_the_first_eighteen_elements\" >6. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#7_Define_valency_by_taking_examples_of_silicon_and_oxygen\" >7. Define valency by taking examples of silicon and oxygen.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#8_Explain_with_examples\" >8. Explain with examples<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#9_has_completely_filled_K_and_L_shells_Explain\" >9. has completely filled K and L shells. Explain.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#10_If_bromine_atom_is_available_in_the_form_of_say_two_isotopes_Calculate_the_average_atomic_mass_of_bromine_atom\" >10. If bromine atom is available in the form of, say, two isotopes . Calculate the average atomic mass of bromine atom.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#11_The_average_atomic_mass_of_a_sample_of_an_element_X_is_162_u_What_are_the_percentages_of_isotopes_in_the_sample\" >11. The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes  in the sample?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#12_If_Z_3_what_would_be_the_valency_of_the_element_Also_name_the_element\" >12. If Z = 3, what would be the valency of the element? Also, name the element.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#13_Composition_of_the_nuclei_of_two_atomic_species_X_and_Y_are_given_as_under\" >13. Composition of the nuclei of two atomic species X and Y are given as under<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#14_For_the_following_statements_write_T_for_True_and_F_for_False\" >14. For the following statements, write T for True and F for False.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#Put_tick_u_against_correct_choice_and_cross_%C3%97_against_wrong_choice_in_questions_15_16_and_17\" >Put tick (\u00fc) against correct choice and cross (\u00d7) against wrong choice in questions 15, 16 and 17<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#16_Isotopes_of_an_element_have\" >16. Isotopes of an element have<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#17_Number_of_valence_electrons_in_Cl%E2%80%93_ion_are\" >17. Number of valence electrons in Cl\u2013 ion are:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#18_Which_one_of_the_following_is_a_correct_electronic_configuration_of_sodium\" >18. Which one of the following is a correct electronic configuration of sodium?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#19_Complete_the_following_table\" >19. Complete the following table.<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#NCERT_Solutions_for_Class_9_Science\" >NCERT Solutions for Class 9 Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/#CBSE_app_for_Class_9\" >CBSE app for Class 9<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 9 Science Structure of the Atom part 2 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 9 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Science\u00a0Structure of the Atom <a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/09_Science_Book.jpg\" alt=\"NCERT Solutions for Class 9 Science Structure of the Atom part 2\" width=\"173\" height=\"232\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_9_Science_Chapter_wise_Solutions\"><\/span><span class=\"underline-text\">NCERT Class 9 Science Chapter wise Solutions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>01 \u2013 \u00a0Matter in Our Surroundings<\/li>\n<li>02 \u2013 Is Mattter Around us Pure<\/li>\n<li>03 \u2013 Atoms and Molecules<\/li>\n<li>04 \u2013 Structure of the Atom<\/li>\n<li>05 \u2013 The Fundamental Unit of Life<\/li>\n<li>06 \u2013 Tissues<\/li>\n<li>07 \u2013 Diversity in Living Organisms<\/li>\n<li>08 \u2013 Motion<\/li>\n<li>09 \u2013 Force and Laws of Motion<\/li>\n<li>10 \u2013 Gravitation<\/li>\n<li>11 \u2013 Word and Energy<\/li>\n<li>12 \u2013 Sound<\/li>\n<li>13 \u2013 Why Do We Fall Ill<\/li>\n<li>14 \u2013 Natural Resources<\/li>\n<li>15 \u2013 Improvement in Food Resources<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science_Structure_of_the_Atom_part_2\"><\/span>NCERT Solutions for Class 9 Science Structure of the Atom part 2<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1Compare_the_properties_of_electrons_protons_and_neutrons\"><\/span><strong>1.Compare the properties of electrons, protons and neutrons.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 2\" class=\"\" style=\"height: 149px; width: 432px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image005.jpg\" \/><\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_What_are_the_limitations_of_JJ_Thomsons_model_of_the_atom\"><\/span><strong>2. What are the limitations of J.J. Thomson\u2019s model of the atom?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Main limitation to the J.J Thomson\u2019s atomic model was that it didn\u2019t explain the arrangement of electrons in an atom.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_What_are_the_limitations_of_Rutherfords_model_of_the_atom\"><\/span><strong>3. What are the limitations of Rutherford\u2019s model of the atom?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Rutherford\u2019s model of atom didn\u2019t explain the stability of atom because as per his model revolving charged electrons while moving through orbit should emit energy and this energy loss will shrink the orbit and ultimately the electron would hit the nucleus and thus atom is unstable but it is not true.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"4_Describe_Bohrs_model_of_the_atom\"><\/span><strong>4. Describe Bohr\u2019s model of the atom.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>To remove the drawbacks of Rutherford\u2019s atomic model and to explain structure of atom in detail Neils Bohr in 1912 proposed a model of atom. The special features of Bohr\u2019s model are given below:<\/p>\n<p style=\"text-align: justify;\"><strong>i)<\/strong> An electron revolves in the orbit of atom with well-defined energy.<\/p>\n<p style=\"text-align: justify;\"><strong>ii)<\/strong> Energy of orbits increases from inner shell to the outer shells i.e. energy for orbit nearest the nucleus is lowest.<\/p>\n<p style=\"text-align: justify;\"><strong>iii)<\/strong> If energy is supplied then electron moves from lower orbit ot the higher orbit and if an electron jumps from higher orbit (energy level) to the lower orbit (energy level) then energy is radiated as electromagnetic waves.<\/p>\n<p style=\"text-align: justify;\"><strong>iv)<\/strong> Each orbit or shell represents an energy level. Such orbits are represented as K,L,M,N,O\u2026\u2026\u2026.. and named from centre to outwards.<\/p>\n<p style=\"text-align: justify;\"><strong>v)<\/strong> The shell or orbits are associated with certain amount of energy and energy of orbits\/shells increases from inward to outwards.eg K&lt;L&lt;M&lt;N&lt;O\u2026\u2026\u2026\u2026<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"5_Compare_all_the_proposed_models_of_an_atom_given_in_this_chapter\"><\/span><strong>5. Compare all the proposed models of an atom given in this chapter.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>There are total three atomic models each of which tried to explain the atomic structure in a better way. Following table compares the specific characteristics of the models:<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 15\" class=\"\" style=\"height: 172px; width: 498px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image006.jpg\" \/><\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"6_Summarise_the_rules_for_writing_of_distribution_of_electrons_in_various_shells_for_the_first_eighteen_elements\"><\/span><strong>6. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The following rules are followed for writing the number of electrons in different energy levels or shells:<\/p>\n<p style=\"text-align: justify;\"><strong>(i)<\/strong> The maximum number of electrons present in a shell is given by the formula<img decoding=\"async\" style=\"height: 22px; width: 26px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image007.png\" \/>, where \u2018n\u2019 is the orbit number or energy level index, 1,2,3,\u2026 Hence the maximum number of electrons in different shells are as follows:<\/p>\n<p style=\"text-align: justify;\">first orbit or K-shell will be<img decoding=\"async\" style=\"height: 20px; width: 95px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image008.png\" \/>,<\/p>\n<p style=\"text-align: justify;\">second orbit or L-shell will be<img decoding=\"async\" style=\"height: 22px; width: 97px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image009.png\" \/>,<\/p>\n<p style=\"text-align: justify;\">third orbit or M-shell will be<img decoding=\"async\" style=\"height: 22px; width: 97px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image010.png\" \/>,<\/p>\n<p style=\"text-align: justify;\">fourth orbit or N-shell will be<img decoding=\"async\" style=\"height: 22px; width: 105px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image011.png\" \/>, and so on.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii)<\/strong> The maximum number of electrons that can be accommodated in the outermost orbit is 8.<\/p>\n<p style=\"text-align: justify;\"><strong>(iii)<\/strong> Electrons are not accommodated in a given shell, unless the inner shells are filled. That is, the shells are filled in a step-wise manner.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"7_Define_valency_by_taking_examples_of_silicon_and_oxygen\"><\/span><strong>7. Define valency by taking examples of silicon and oxygen.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>That number of electrons (present in outermost shell) \/valence electrons which an atom gives or takes or shares to complete its octet, or acquire stable configuration. Therefore, valency of sulphur = 16= 2,8,6= 2 electrons can be gained easily hence valency is 2.<\/p>\n<p style=\"text-align: justify;\">valency of oxygen = 8 = 2,6 = 2 electrons can be gained easily hence valency is 2.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"8_Explain_with_examples\"><\/span><strong>8. Explain with examples <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(i) Atomic number,<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(ii) Mass number,<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(iii) Isotopes and <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>iv) Isobars. <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Give any two uses of isotopes.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. i)<\/strong> Atomic number = It is the number of protons present inside nucleus of the atom.<\/p>\n<p style=\"text-align: justify;\">It is represented as Z. For eg: for hydrogen Z= 1, because in hydrogen atom the number of protons is 1.<\/p>\n<p style=\"text-align: justify;\"><strong>ii)<\/strong> Mass number = It is the total number of protons and neutrons present inside the nucleus of an atom and is represented by A = P + N mass of carbon is 12 u because it has 6 protons and 6 neutrons, 6 u + 6 u = 12 u.<\/p>\n<p style=\"text-align: justify;\"><strong>iii)<\/strong> Isotopes = They are atoms of the same element and have same atomic number but different mass number\/atomic mass. for example: carbon, <img decoding=\"async\" style=\"height: 25px; width: 76px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image012.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>iv)<\/strong> Isobars = They are atoms of different elements having same mass number but different atomic number. for example, calcium, atomic number 20, and argon, atomic number 18. The number of electrons in these atoms is different, but the mass number of both these elements is 40. That is, the total number of neutrons is the same in the atoms of this pair of elements.<\/p>\n<p style=\"text-align: justify;\"><strong>Two uses of isotopes are as follows:<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(i)<\/strong> An isotope of uranium is used as a fuel in nuclear reactors.<\/p>\n<p style=\"text-align: justify;\"><strong>(ii)<\/strong> An isotope of cobalt is used in the treatment of cancer.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"9_has_completely_filled_K_and_L_shells_Explain\"><\/span><strong>9. <img decoding=\"async\" style=\"height: 22px; width: 31px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image013.png\" \/>has completely filled K and L shells. Explain.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Na has atomic number 11, so its electronic configuration is = 2,8,1<\/p>\n<p style=\"text-align: justify;\">When it gives away its outermost shell single electron it changes to Na<sup>+<\/sup> =10= 2,8<\/p>\n<p style=\"text-align: justify;\">The above configuration indicates completely filled K,L shells.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"10_If_bromine_atom_is_available_in_the_form_of_say_two_isotopes_Calculate_the_average_atomic_mass_of_bromine_atom\"><\/span><strong>10. If bromine atom is available in the form of, say, two isotopes <img decoding=\"async\" style=\"height: 25px; width: 197px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image014.png\" \/>. Calculate the average atomic mass of bromine atom.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The average atomic mass of bromine = <img decoding=\"async\" style=\"height: 26px; width: 187px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image015.png\" \/><\/p>\n<p style=\"text-align: justify;\">= 3926.3 + 4074.3\/100<\/p>\n<p style=\"text-align: justify;\">= 8000.6\/100<\/p>\n<p style=\"text-align: justify;\">= 80 u<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"11_The_average_atomic_mass_of_a_sample_of_an_element_X_is_162_u_What_are_the_percentages_of_isotopes_in_the_sample\"><\/span><strong>11. The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes <img decoding=\"async\" style=\"height: 25px; width: 81px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image016.png\" \/> in the sample?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Since average atomic mass = <img decoding=\"async\" style=\"height: 26px; width: 181px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image017.png\" \/><\/p>\n<p style=\"text-align: justify;\">16.2= <img decoding=\"async\" style=\"height: 19px; width: 141px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image018.png\" \/><\/p>\n<p style=\"text-align: justify;\">1620 = <img decoding=\"async\" style=\"height: 19px; width: 74px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image019.png\" \/><\/p>\n<p style=\"text-align: justify;\">2x= 1800 \u2013 1620<\/p>\n<p style=\"text-align: justify;\">x = 180\/2 = 90<\/p>\n<p style=\"text-align: justify;\">When 90% is the X-16 sample so for X-18 sample % = 100-90=10%<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"12_If_Z_3_what_would_be_the_valency_of_the_element_Also_name_the_element\"><\/span><strong>12. If Z = 3, what would be the valency of the element? Also, name the element.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>When Z = 3, so that element has 3 electrons in its shells distributed as = 2, 1. Its valency is 1 because it can easily give away its outermost single electron and the element is Lithium(Li).<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"13_Composition_of_the_nuclei_of_two_atomic_species_X_and_Y_are_given_as_under\"><\/span><strong>13. Composition of the nuclei of two atomic species X and Y are given as under<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 3\" style=\"height: 64px; width: 135px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image020.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>Give the mass numbers of X and Y. What is the relation between the two species?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The mass number of X = 6+6 = 12<\/p>\n<p style=\"text-align: justify;\">The mass number of Y = 6+8 = 14<\/p>\n<p style=\"text-align: justify;\">since their number of protons are same but atomic mass are different so they are isotopes.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"14_For_the_following_statements_write_T_for_True_and_F_for_False\"><\/span><strong>14. For the following statements, write T for True and F for False.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) The mass of an electron is about 12000 times that of proton.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (a)<\/strong> false<\/p>\n<p style=\"text-align: justify;\"><strong>(b)<\/strong> true<\/p>\n<p style=\"text-align: justify;\"><strong>(c)<\/strong> true<\/p>\n<p style=\"text-align: justify;\"><strong>(d)<\/strong> false<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Put_tick_u_against_correct_choice_and_cross_%C3%97_against_wrong_choice_in_questions_15_16_and_17\"><\/span><strong>Put tick (\u00fc) against correct choice and cross (\u00d7) against wrong choice in questions 15, 16 and 17<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>15. Rutherford\u2019s alpha-particle scattering experiment was responsible for the discovery of<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(a) Atomic Nucleus <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) Electron<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) Proton <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) Neutron<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (c)<\/strong> proton<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"16_Isotopes_of_an_element_have\"><\/span><strong>16. Isotopes of an element have<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) the same physical properties<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) different chemical properties<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) different number of neutrons<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) different atomic numbers.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (a)<\/strong> the same physical properties<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"17_Number_of_valence_electrons_in_Cl%E2%80%93_ion_are\"><\/span><strong>17. Number of valence electrons in Cl\u2013 ion are:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) 16 <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) 8 <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) 17 <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) 18<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (b)<\/strong> 8<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"18_Which_one_of_the_following_is_a_correct_electronic_configuration_of_sodium\"><\/span><strong>18. Which one of the following is a correct electronic configuration of sodium?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) 2,8 <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) 8,2,1 <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(c) 2,1,8 <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(d) 2,8,1.<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (a)<\/strong> 2,8,1<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"19_Complete_the_following_table\"><\/span><strong>19. Complete the following table. <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 17\" class=\"\" style=\"height: 120px; width: 380px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image021.jpg\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 16\" class=\"\" style=\"height: 223px; width: 374px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch04\/image022.jpg\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science\"><\/span>NCERT Solutions for Class 9 Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 9 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 9 Science includes text book solutions .NCERT Solutions for CBSE Class 9 Science have total 15 chapters. 9 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 9 solutions PDF and Science ncert class 9 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Class_9\"><\/span>CBSE app for Class 9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 9 Science, Computer Science, Home Science,Hindi ,English, Maths Social Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Science Structure of the Atom part 2 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT &#8230; <a title=\"NCERT Solutions for Class 9 Science Structure of the Atom part 2\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-for-class-9-science-structure-of-the-atom-part-2\/\" aria-label=\"More on NCERT Solutions for Class 9 Science Structure of the Atom part 2\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1377],"tags":[283,1344,216,349],"class_list":["post-4131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-science-cbse-class-09","tag-cbse-study-material","tag-class-9","tag-ncert-solutions","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Science Structure of the Atom part 2<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 9 Science Structure of the Atom part 2 in PDF format for free download. 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