{"id":9183,"date":"2018-02-09T11:21:44","date_gmt":"2018-02-09T05:51:44","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/?p=9183"},"modified":"2018-10-05T12:31:58","modified_gmt":"2018-10-05T07:01:58","slug":"classification-elements-periodicity-properties-class-11-notes-chemistry","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/","title":{"rendered":"Classification of Elements and Periodicity in Properties class 11 Notes Chemistry"},"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\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#CBSE_Guide_Classification_of_Elements_and_Periodicity_in_Properties_class_11_Notes\" >CBSE Guide Classification of Elements and Periodicity in Properties class 11 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\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#Classification_of_Elements_and_Periodicity_in_Properties_class_11_Notes_Chemistry\" >Classification of Elements and Periodicity in Properties class 11 Notes Chemistry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#Class_11_Chemistry_Revision_Notes_Chapter_3_Classification_of_Elements_and_Periodicity_in_Properties\" >Class 11 Chemistry Revision Notes Chapter 3 Classification of Elements and Periodicity in Properties<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#Merits_of_Mendeleevs_periodic_table\" >Merits of Mendeleev&#8217;s periodic table:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#Demerits_of_Merits_of_Mendeleevs_periodic_table\" >Demerits of Merits of Mendeleev&#8217;s periodic table:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#Modern_Periodic_Table_arranges_the_elements_in_the_order_of_their_atomic_numbers_in_seven_horizontal_rows_periods_and_eighteen_vertical_columns_groups_or_families\" >Modern Periodic Table arranges the elements in the order of their atomic numbers in seven horizontal rows (periods) and eighteen vertical columns (groups or families).<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#Classification_of_Elements_and_Periodicity_in_Properties_class_11_Notes\" >Classification of Elements and Periodicity in Properties class 11 Notes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/#CBSE_Class_11_Revision_Notes_and_Key_Points\" >CBSE Class 11 Revision Notes and Key Points<\/a><\/li><\/ul><\/nav><\/div>\n<p><strong>CBSE Chemistry Chapter 3 Classification of Elements and Periodicity in Properties class 11 Notes Chemistry in PDF<\/strong> are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Classification of Elements and Periodicity in Properties class 11 Notes Chemistry latest chapter wise notes for quick preparation of CBSE exams and school based annual examinations. Class 11 Chemistry notes on Chapter 3 Classification of Elements and Periodicity in Properties class 11 Notes Chemistry are also available for download in CBSE Guide website.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Guide_Classification_of_Elements_and_Periodicity_in_Properties_class_11_Notes\"><\/span>CBSE Guide Classification of Elements and Periodicity in Properties class 11 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 11 Chemistry 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=\"Classification_of_Elements_and_Periodicity_in_Properties_class_11_Notes_Chemistry\"><\/span>Classification of Elements and Periodicity in Properties class 11 Notes Chemistry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Download CBSE class 11th revision notes for Chapter 3 Classification of Elements and Periodicity in Properties class 11 Notes Chemistry in PDF format for free. Download revision notes for Classification of Elements and Periodicity in Properties class 11 Notes Chemistry and score high in exams. These are the Classification of Elements and Periodicity in Properties class 11 Notes Chemistry 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<p style=\"text-align: center;\"><strong>Revision Notes for Class 11 Chemistry\u00a0<a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-11-chemistry\/1356\/cbse-revision-notes\/7\/\">Download as PDF<\/a><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Class_11_Chemistry_Revision_Notes_Chapter_3_Classification_of_Elements_and_Periodicity_in_Properties\"><\/span><strong>Class 11 Chemistry Revision Notes Chapter 3 Classification of Elements and Periodicity in Properties<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><strong>Periodic Classification <\/strong><\/li>\n<li><strong>Modern Periodic Law and the present form of the Periodic Table <\/strong><\/li>\n<li><strong>Nomenclature of Elements<\/strong><\/li>\n<li><strong>Electronic Configurations of Elements and Periodic Trends<\/strong><\/li>\n<\/ol>\n<p>Johann Dobereiner classified elements in group of three elements called triads.<\/p>\n<p>According to Mendeleev&#8217;s periodic law the physical and chemical properties of elements are periodic functions of their atomic weights.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Merits_of_Mendeleevs_periodic_table\"><\/span><strong>Merits of Mendeleev&#8217;s periodic table:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Mendeleev&#8217;s periodic table helped to remember and study the properties of large number of elements.<\/li>\n<li>Mendeleev&#8217;s periodic table helped in correcting the atomic masses of some of the elements like gold, beryllium and platinum based on their positions in the periodic table.<\/li>\n<li>Mendeleev could predict the properties of some undiscovered elements like scandium, gallium and germanium.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Demerits_of_Merits_of_Mendeleevs_periodic_table\"><\/span><strong>Demerits of Merits of Mendeleev&#8217;s periodic table<\/strong>:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Position of hydrogen was not correctly defined in periodic table.<\/li>\n<li>In certain pairs of elements increasing order of atomic masses was not obeyed. For example argon (Ar, atomic mass 39.9) is placed before potassium (K, atomic mass 39.1)<\/li>\n<li>Isotopes were not given separate places in the periodic table.<\/li>\n<li>Some similar elements are separated and dissimilar elements are grouped together.<\/li>\n<\/ul>\n<p>Moseley studied the frequencies of the X-rays emitted from the elements. With these experiments he concluded that atomic number is more fundamental property of an element than its atomic mass.<\/p>\n<p>After Moseley&#8217;s experiments, Mendeleev&#8217;s periodic law was modified to modern periodic law.<\/p>\n<p>Modern periodic table is also referred to as long form of periodic table<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Modern_Periodic_Table_arranges_the_elements_in_the_order_of_their_atomic_numbers_in_seven_horizontal_rows_periods_and_eighteen_vertical_columns_groups_or_families\"><\/span>Modern Periodic Table arranges the elements in the order of their atomic numbers in seven horizontal rows<strong> (periods<\/strong>) and eighteen vertical columns (<strong>groups or families<\/strong>).<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Atomic numbers in a period are consecutive, whereas in a group they increase in a pattern.<\/li>\n<li>Elements of the same group have similar <strong>valence shell<\/strong> electronic configuration and, therefore, exhibit similar chemical properties.<\/li>\n<li>However, the elements of the same period have incrementally increasing number of electrons from left to right, and, therefore, have different valencies.<\/li>\n<li>Four types of elements can be recognized in the periodic table on the basis of their electronic configurations. These are <strong>s-block, p-block, d-block<\/strong> and <strong>f -block<\/strong> elements.<\/li>\n<li><strong>Hydrogen <\/strong>with one electron in the 1s orbital occupies a unique position in the periodic table.<\/li>\n<li><strong>Metals <\/strong>comprise more than seventy eight per cent of the known elements.<\/li>\n<li>Non-<strong>metals,<\/strong> which are located at the top of the periodic table, are less than twenty in number.<\/li>\n<li>Elements of group 18 having ns<sup>2<\/sup> np<sup>6<\/sup> configuration are called noble gases.<\/li>\n<li>Elements of group 17 are called halogens.<\/li>\n<li>Elements which lie at the border line between metals and non-metals (e.g., Si, Ge, As) are called <strong>metalloids <\/strong>or <strong>semi-metals<\/strong>.<\/li>\n<li>Metallic character increases with increasing atomic number in a group whereas decreases from left to right in a period.<\/li>\n<li>The physical and chemical properties of elements vary periodically with their atomic numbers.<\/li>\n<li>Elements in lanthanoid and actinoid series are called inner transition<br \/>\nseries.<\/li>\n<\/ul>\n<p>Nomenclature of an element is done by IUPAC. According to IUPAC, a new element is given a temporary name until it&#8217;s discovery is proved and its name is officially recognized. This nomenclature is based on Latin words for their numbers.<\/p>\n<p>The interim names of the newly discovered elements are derived by combining together the roots in order of digits which make up the atomic number and ium is added at the end.<\/p>\n<p><strong>Periodic trends<\/strong> are observed <strong>in atomic sizes, ionization enthalpies, electron gain enthalpies, electronegativity and valence.<\/strong><\/p>\n<ul>\n<li>The atomic radii decrease while going from left to right in a period and increase with atomic number in a group.<\/li>\n<li>Ionization enthalpies generally increase across a period and decrease down a group. Electronegativity also shows a similar trend.<\/li>\n<li><strong>Electron gain enthalpies<\/strong>, in general, become more negative across a period and less negative down a group.<\/li>\n<li>Group 17 elements have high negative electron gain enthalpy because they can attain a stable electronic configuration as of noble gases by accepting an electron.<\/li>\n<li>There is some periodicity in valence, for example, among representative elements, the valence is either equal to the number of electrons in the outermost orbitals or eight minus this number.<\/li>\n<li><strong>Chemical reactivity<\/strong> is highest at the two extremes of a period and is lowest in the centre. The reactivity on the left extreme of a period is because of the ease of electron loss (or low ionization enthalpy).<\/li>\n<li>Highly reactive elements do not occur in nature in free state; they usually occur in the combined form. Oxides formed of the elements on the left are basic and of the elements on the right are acidic in nature. Oxides of elements in the centre are amphoteric or neutral.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Classification_of_Elements_and_Periodicity_in_Properties_class_11_Notes\"><\/span>Classification of Elements and Periodicity in Properties class 11 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 11 Chemistry PDF<\/li>\n<li>Revision notes Class 11 Chemistry \u2013 CBSE<\/li>\n<li>CBSE Revisions notes and Key Points Class 11 Chemistry<\/li>\n<li>Summary of the NCERT books all chapters in Chemistry class 11<\/li>\n<li>Short notes for CBSE class 11th Chemistry<\/li>\n<li>Key notes and chapter summary of Chemistry class 11<\/li>\n<li>Quick revision notes for CBSE exams<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_Class_11_Revision_Notes_and_Key_Points\"><\/span><strong>CBSE Class 11 Revision Notes and Key Points<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Classification of Elements and Periodicity in Properties class 11 Notes Chemistry. CBSE quick revision note for class-11 Chemistry, Physics, 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-11-physics\/1340\/cbse-revision-notes\/7\/\">Physics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-chemistry\/1356\/cbse-revision-notes\/7\/\">Chemistry<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-mathematics\/1371\/cbse-revision-notes\/7\/\">Mathematics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-biology\/1388\/cbse-revision-notes\/7\/\">Biology<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-accountancy\/1411\/cbse-revision-notes\/7\/\">Accountancy<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-economics\/1423\/cbse-revision-notes\/7\/\">Economics<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-business-studies\/1740\/cbse-revision-notes\/7\/\">Business Studies<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-computer-science\/1852\/cbse-revision-notes\/7\/\">Computer Science<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-informatics-practices\/1874\/cbse-revision-notes\/7\/\">Informatics Practices<\/a><\/li>\n<li><a href=\"http:\/\/mycbseguide.com\/downloads\/cbse-class-11-geography\/1864\/cbse-revision-notes\/7\/\">Geography<\/a><\/li>\n<\/ul>\n<p>To download Classification of Elements and Periodicity in Properties class 11 Notes, sample paper for class 11 Chemistry, Physics, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home 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<ul>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/some-basic-concepts-of-chemistry-class-11-notes-chemistry\/\">Some Basic Concepts of Chemistry class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/structure-atom-class-11-notes-chemistry\/\">Structure of Atom class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/chemical-bonding-and-molecular-structure-class-11-notes-chemistry\/\">Chemical Bonding and Molecular Structure class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/states-matter-class-11-notes-chemistry\/\">States of Matter class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/thermodynamics-class-11-notes-chemistry\/\">Thermodynamics class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/equilibrium-class-11-notes-chemistry\/\">Equilibrium class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/redox-reactions-class-11-notes-chemistry\/\">Redox Reactions class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/hydrogen-class-11-notes-chemistry\/\">Hydrogen class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/s-block-elements-class-11-notes-chemistry\/\">The s-Block Elements class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/the-p-block-elements-class-11-notes-chemistry\/\">The p-Block Elements class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/organic-chemistry-some-basic-principles-and-techniques-class-11-notes-chemistry\/\">Organic Chemistry \u2013 Some Basic Principles and Techniques class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/hydrocarbons-class-11-notes-chemistry\/\">Hydrocarbons class 11 Notes Chemistry<\/a><\/li>\n<li class=\"entry-title\"><a href=\"https:\/\/mycbseguide.com\/blog\/environmental-chemistry-class-11-notes-chemistry\/\">Environmental Chemistry class 11 Notes Chemistry<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>CBSE Chemistry Chapter 3 Classification of Elements and Periodicity in Properties class 11 Notes Chemistry in PDF are available for free download in myCBSEguide mobile app. The best app for CBSE students now provides Classification of Elements and Periodicity in Properties class 11 Notes Chemistry latest chapter wise notes for quick preparation of CBSE exams &#8230; <a title=\"Classification of Elements and Periodicity in Properties class 11 Notes Chemistry\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/classification-elements-periodicity-properties-class-11-notes-chemistry\/\" aria-label=\"More on Classification of Elements and Periodicity in Properties class 11 Notes Chemistry\">Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":9166,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47,456],"tags":[457,150,504,527,426,240],"class_list":["post-9183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cbse-class-11","category-revision-notes","tag-cbse-notes","tag-cbse-notes-and-key-points","tag-chemistry-notes","tag-classification-of-elements-periodicity-in-properties","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>Classification of Elements and Periodicity in Properties class 11 Notes Chemistry | myCBSEguide<\/title>\n<meta name=\"description\" content=\"Classification of Elements and Periodicity in Properties class 11 Notes Chemistry Ch 3 PDF format free download. 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