{"id":9591,"date":"2018-02-13T10:49:52","date_gmt":"2018-02-13T05:19:52","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=9591"},"modified":"2018-03-19T11:38:40","modified_gmt":"2018-03-19T06:08:40","slug":"atoms-molecules-class-9-notes-science","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/","title":{"rendered":"Atoms and Molecules class 9 Notes Science"},"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' ><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/#CBSE_Guide_Atoms_and_Molecules_class_9_Notes\" >CBSE Guide Atoms and Molecules class 9 Notes<\/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\/atoms-molecules-class-9-notes-science\/#9_Science_notes_Chapter_3_Atoms_and_Molecules\" >9 Science notes Chapter 3 Atoms and Molecules<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/#Download_Revision_Notes_as_PDF\" >Download Revision Notes as PDF<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/#Atoms_and_Molecules_class_9_Notes\" >Atoms and Molecules class 9 Notes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/#CBSE_Class-9_Revision_Notes_and_Key_Points\" >CBSE Class-9 Revision Notes and Key Points<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>CBSE class 9 Science Chapter 3 Atoms and Molecules notes in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Atoms and Molecules class 9 Notes latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Class 9 Science notes on Chapter 3 Atoms and Molecules are also available for download in CBSE Guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Guide_Atoms_and_Molecules_class_9_Notes\"><\/span>CBSE Guide Atoms and Molecules class 9 Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>CBSE guide notes are the comprehensive notes which covers the latest syllabus of CBSE and NCERT. It includes all the topics given in NCERT class 9 Science text book. Users can download CBSE guide quick revision notes from myCBSEguide mobile app and my CBSE guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"9_Science_notes_Chapter_3_Atoms_and_Molecules\"><\/span>9 Science notes Chapter 3 Atoms and Molecules<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download CBSE class 9th revision notes for Chapter 3 Atoms and Molecules in PDF format for free. Download revision notes for Atoms and Molecules class 9 Notes and score high in exams. These are the Atoms and Molecules class 9 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.<\/p>\n<h1 style=\"text-align: center\"><span class=\"ez-toc-section\" id=\"Download_Revision_Notes_as_PDF\"><\/span><strong><a href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/cbse-revision-notes\/7\/\">Download Revision Notes as PDF<\/a><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p style=\"text-align: center\"><strong>CBSE Class 9 Science<br \/>\nRevision Notes<br \/>\nCHAPTER \u2013 3<\/strong><br \/>\n<u><strong>Atoms and Molecules<\/strong><\/u><\/p>\n<p><strong>1. <\/strong><u><strong>Laws of Chemical Combination<\/strong><\/u><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_02.jpg\" \/><\/p>\n<p><strong>Limitation of \u201cLaw of definite proportion\u201d<\/strong><br \/>\nThis law does not hold good when the compound is obtained by using different isotopes of the combining elements.<\/p>\n<p><strong>2. <\/strong><u><strong>John Daltons Atomic Theory<\/strong><\/u><br \/>\nUsing his theory, Dalton rationalized the various laws of chemical combination which were in existence at that time. However, he assumed that the simplest compound of two elements must be binary.<\/p>\n<p><strong>3. <\/strong><u><strong>Atoms, Molecules, Ions &amp; Chemical Formula<\/strong><\/u><br \/>\n<strong>Atom<\/strong><br \/>\nAn atom is the smallest particle of an element which can take part in a chemical reaction. It may or may not exist freely.<\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? \\downarrow\" \/><\/span><\/span><\/p>\n<p>Each atom of an element shows all the properties of the element.<\/p>\n<p><strong>Molecule<\/strong><br \/>\nThe smallest particle of matter (element or compound) which can exist in a free state.<\/p>\n<p><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? \\downarrow\" \/><\/span><\/span><\/p>\n<p>The properties of a substance are the properties of its molecules.<\/p>\n<ul>\n<li><strong>MOLECULES OF ELEMENT<\/strong> : The molecules of an element are constituted by the same type of atoms.<\/li>\n<li><strong>MOLECULES OF COMPOUND<\/strong>: Atoms of different elements join together in definite proportions to form molecules of compounds. (hetero atomic molecules)<\/li>\n<li><strong>ATOMICITY<\/strong>: The number of atoms contained in a molecule of a substance (element or compound) is called its atomic<\/li>\n<\/ul>\n<table border=\"1\" width=\"241\" cellspacing=\"0\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>Element<\/td>\n<td>Formula<\/td>\n<td>Atomicity<\/td>\n<\/tr>\n<tr>\n<td>Ozone<\/td>\n<td>O<sub>3<\/sub><\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>Phosphorus<\/td>\n<td>P<sub>4<\/sub><\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>Sulphur<\/td>\n<td>S<sub>8<\/sub><\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>Oxygen<\/td>\n<td>O<sub>2<\/sub><\/td>\n<td>2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Based upon atomicity molecules can be classified as follows.<\/li>\n<li><strong>Monoatomic molecules<\/strong>: Noble gases helium, neon and argon exist as He Ne and Ar respectively.<\/li>\n<\/ul>\n<p><strong>Diatomic molecules<\/strong>: <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{H_2},\\;{O_2},\\;{N_2},\\;C{l_2},\\;CO,\\;HCl.\" \/><\/span><\/span><br \/>\n<strong>Triatomic molecules<\/strong>: <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{O_3},\\;C{O_2},\\;N{O_2}\" \/><\/span><\/span><\/p>\n<p><strong>SYMBOLS <\/strong><\/p>\n<ul>\n<li>The abbreviation used to represent an element is generally the first letter in capital of the English name of element.<br \/>\nOxygen <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? \\to\" \/><\/span><\/span>\u00a0O Nitrogen <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? \\to\" \/><\/span><\/span>\u00a0N<\/li>\n<li>When the names of two or more elements begin with the same initial letter, the initial letter followed by the letter appearing later in the name is used to symbolize the element<br \/>\nBarium <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? \\to\" \/><\/span><\/span>\u00a0Ba Bismuth <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi? \\to\" \/><\/span><\/span>\u00a0Bi<\/li>\n<\/ul>\n<p><strong>Symbols of some elements are derived from their Latin names<\/strong><\/p>\n<table border=\"1\" width=\"266\" cellspacing=\"0\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>ELEMENT<\/td>\n<td>LATIN NAME<\/td>\n<td>SYMBOL<\/td>\n<\/tr>\n<tr>\n<td>Sodium<\/td>\n<td>Natrium<\/td>\n<td>Na<\/td>\n<\/tr>\n<tr>\n<td>Copper<\/td>\n<td>Cuprum<\/td>\n<td>Cu<\/td>\n<\/tr>\n<tr>\n<td>Potassium<\/td>\n<td>Kalium<\/td>\n<td>K<\/td>\n<\/tr>\n<tr>\n<td>Iron<\/td>\n<td>Ferrum<\/td>\n<td>Fe<\/td>\n<\/tr>\n<tr>\n<td>Mercury<\/td>\n<td>Hydragyrum<\/td>\n<td>Hg<\/td>\n<\/tr>\n<tr>\n<td>Tungsten<\/td>\n<td>Wolfram<\/td>\n<td>W<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_03.jpg\" \/><br \/>\n<strong>Polyatomic Ion<\/strong> : A group of atoms carrying a charge is as polyatomic ion.<br \/>\nEg. <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\begin{gathered} N{H_4}^ + - Ammoniumlon: C{O_3}^{2 - } - Carbonate\\;ion \\\\ \\end{gathered}\" \/><\/span><\/span><\/p>\n<p><strong>Valency<\/strong> : The number of electrons which an atom can lose , gain or share to form a bond.<\/p>\n<p>OR<\/p>\n<p>It is the combining capacity of an atom of the element.<\/p>\n<ul>\n<li><strong>Chemical Formula <\/strong>: A chemical formula is a short method of representing chemical elements and compounds.<\/li>\n<\/ul>\n<p><strong>Writing a Chemical Formula -CRISS-CROSS rule<\/strong><br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_04.jpg\" width=\"518\" height=\"216\" \/><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_05.jpg\" \/><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_06.jpg\" \/><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_07.jpg\" \/><\/p>\n<p>RULES &gt; All subscripts must be reduced to lowest term (except for molecular or<br \/>\n<strong>Examples<\/strong><\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"3\">\n<tbody>\n<tr>\n<td>CATION<\/td>\n<td>ANION<\/td>\n<td>FORMULA<\/td>\n<td>NAME<\/td>\n<\/tr>\n<tr>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?A{l^{3 + }}\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?S{O_4}^{2 - }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?A{l_2}{(S{O_4})_3}\" \/><\/span><\/span><\/td>\n<td>Aluminium sulphate<\/td>\n<\/tr>\n<tr>\n<td>Ca<\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?HC{O_3}^ -\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?Ca{(HC{O_3})_2}\" \/><\/span><\/span><\/td>\n<td>Calcium bicarbonate<\/td>\n<\/tr>\n<tr>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?N{H_4}^ +\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?C{l^ - }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?N{H_4}Cl\" \/><\/span><\/span><\/td>\n<td>Ammonium chloride<\/td>\n<\/tr>\n<tr>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?N{a^ + }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?C{O_3}^{2 - }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?HC{O_3}^ -\" \/><\/span><\/span><\/td>\n<td>Sodium carbonate<\/td>\n<\/tr>\n<tr>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?M{g^{2 + }}\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?O{H^ - }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?Mg{(OH)_2}\" \/><\/span><\/span><\/td>\n<td>Magnesium hydroxide<\/td>\n<\/tr>\n<tr>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?N{a^ + }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?P{O_4}^{3 - }\" \/><\/span><\/span><\/td>\n<td><span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?N{a_3}P{O_4}\" \/><\/span><\/span><\/td>\n<td>Sodium phosphate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>4. Mole Concept <\/strong><\/p>\n<p>The mole (mol) is the amount of a substance that contains as many elementary entities as\u00a0there are atoms in exactly 12.00 grams of <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{}^{12}C\" \/><\/span><\/span><\/p>\n<p><strong>The Avogadro constant is named after the early nineteenth century Italian scientist Amedeo Avogadro.<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_08.jpg\" \/><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_09.jpg\" \/><\/p>\n<p><strong>GRAM MOLECULAR MASS<\/strong><br \/>\nGram molecular mass is the mass in grams of one mole of a molecular substance.<br \/>\nEx: The molecular mass of <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{N_2}\" \/><\/span><\/span>\u00a0is 28, so the gram molecular mass of <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{N_2}\" \/><\/span><\/span>\u00a0is 28 g.<\/p>\n<p><strong>ATOMIC MASS UNIT<\/strong><br \/>\nAn atomic mass unit or amu is one twelfth of the mass of an unbound atom of carbon-12. It is a unit of mass used to express atomic masses and molecular masses.<br \/>\n<strong>Also Known As: Unified Atomic Mass Unit (u).<\/strong><\/p>\n<p><strong>MOLECULAR MASS :<\/strong> A number equal to the sum of the atomic masses of the atoms in a molecule. The molecular mass gives the mass of a molecule relative to that of the 12 C atom, which is taken to have a mass of 12.<br \/>\n<strong>Examples:<\/strong> The molecular mass of <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?{C_2}{H_6}\" \/><\/span><\/span>\u00a0is approximately 30 or <span class=\"cke_widget_wrapper cke_widget_inline cke_widget_selected\"><span class=\"math-tex cke_widget_element\"><img decoding=\"async\" src=\"https:\/\/elpiscart.com\/cgi-bin\/mathtex.cgi?\\left[ {\\left( {2{\\text{ }} \\times {\\text{ }}12} \\right){\\text{ }} + {\\text{ }}\\left( {6{\\text{ }} \\times {\\text{ }}1} \\right)} \\right]\" \/><\/span><\/span>. Therefore the molecule is about 2.5 times as heavy as the 12C atom or about the same mass as the NO atom with a molecular mass of 30 or (14 +16).<\/p>\n<p><strong>5. Molar Mass &amp; Avogadro Constant<\/strong><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_10.png\" \/><br \/>\n<img decoding=\"async\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/revise\/09\/science\/09_sc_ch03_11.jpg\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Atoms_and_Molecules_class_9_Notes\"><\/span>Atoms and Molecules class 9 Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>CBSE Revision notes (PDF Download) Free<\/li>\n<li>CBSE Revision notes for Class 9 Science PDF<\/li>\n<li>CBSE Revision notes Class 9 Science \u2013 CBSE<\/li>\n<li>CBSE Revisions notes and Key Points Class 9 Science<\/li>\n<li>Summary of the NCERT books all chapters in Science class 9<\/li>\n<li>Short notes for CBSE class 9th Science<\/li>\n<li>Key notes and chapter summary of Science class 9<\/li>\n<li>Quick revision notes for CBSE exams<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Class-9_Revision_Notes_and_Key_Points\"><\/span><strong>CBSE Class-9 Revision Notes and Key Points<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Atoms and Molecules class 9 Notes. CBSE quick revision note for Class-9 Science, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.<\/p>\n<ul>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-mathematics\/1234\/cbse-revision-notes\/7\/\" target=\"_blank\" rel=\"noopener\">Revision Notes for class-09 Mathematics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/cbse-revision-notes\/7\/\" target=\"_blank\" rel=\"noopener\">Revision Notes for class-09 Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-social-science\/1895\/cbse-revision-notes\/7\/\" target=\"_blank\" rel=\"noopener\">Revision Notes for class-09 Social Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-09-english-communicative\/1900\/cbse-revision-notes\/7\/\" target=\"_blank\" rel=\"noopener\">Revision Notes for class-09 English Communicative<\/a><\/li>\n<\/ul>\n<p>To download Atoms and Molecules class 9 Notes, sample paper for class 9 Mathematics, Social Science, Science, English Communicative; 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<ul>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/matter-surrounding-class-9-notes-science\/\">Matter in Our Surrounding class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/matter-around-us-pure-class-9-notes-science\/\">Is Matter around Us Pure class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/\">Atoms and Molecules class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/structure-atoms-class-9-notes-science\/\">Structure of the Atoms class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/fundamental-unit-life-class-9-notes-science\/\">The Fundamental Unit of Life class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/tissues-class-9-notes-science\/\">Tissues class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/diversity-living-organisms-class-9-notes-science\/\">Diversity in Living Organisms class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/motion-class-9-notes-science\/\">Motion class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/forces-laws-motion-class-9-notes-science\/\">Forces and Laws of Motion class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/gravitation-class-9-notes-science\/\">Gravitation class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/work-energy-class-9-notes-science\/\">Work and Energy class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/sound-class-9-notes-science\/\">Sound class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/fall-ill-class-9-notes-science\/\">Why Do We Fall ill class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/natural-resources-class-9-notes-science\/\">Natural Resources class 9 Notes Science<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/improvement-food-resources-class-9-notes-science\/\">Improvement in Food Resources class 9 Notes Science<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CBSE class 9 Science Chapter 3 Atoms and Molecules notes in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Atoms and Molecules class 9 Notes latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Class 9 Science notes on &#8230; <a title=\"Atoms and Molecules class 9 Notes Science\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/\" aria-label=\"More on Atoms and Molecules class 9 Notes Science\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":9574,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45,456],"tags":[660,457,150,426,240],"class_list":["post-9591","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cbse-class-09","category-revision-notes","tag-atoms-and-molecules","tag-cbse-notes","tag-cbse-notes-and-key-points","tag-quick-revision","tag-quick-revision-notes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Atoms and Molecules class 9 Notes Science | myCBSEguide<\/title>\n<meta name=\"description\" content=\"Atoms and Molecules class 9 Notes Social Science chapter 3 in PDF format for free download. Notes for CBSE exams.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mycbseguide.com\/blog\/atoms-molecules-class-9-notes-science\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Atoms and Molecules class 9 Notes Science | myCBSEguide\" \/>\n<meta property=\"og:description\" content=\"Atoms and Molecules class 9 Notes Social Science chapter 3 in PDF format for free download. 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