{"id":19275,"date":"2018-01-26T11:51:25","date_gmt":"2018-01-26T11:51:25","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=19275"},"modified":"2020-11-23T17:28:08","modified_gmt":"2020-11-23T11:58:08","slug":"frank-icse-solutions-class-9-chemistry-periodic-table","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/frank-icse-solutions-class-9-chemistry-periodic-table\/","title":{"rendered":"Frank ICSE Solutions for Class 9 Chemistry – The Periodic Table"},"content":{"rendered":"
PAGE NO :132<\/strong><\/span> Solution 2: Solution 3: Solution 4:<\/strong><\/span> Solution 5:<\/strong><\/span><\/p>\n Solution 6: Solution 7: Solution 8:<\/strong><\/span><\/p>\n Solution 9: Solution 10: Solution 11: Solution 12: Solution 13: Solution 14:<\/strong><\/span><\/p>\n PAGE NO :133 Solution 16:<\/strong><\/span><\/p>\n Solution 17:<\/strong><\/span><\/p>\n Solution 18:<\/strong><\/span><\/p>\n PAGE NO :134 Solution 20: Solution 21: The general name of such elements is noble gas or inert elements.<\/p>\n Solution 22:<\/strong><\/span><\/p>\n Solution 23:<\/strong><\/span><\/p>\n Solution 24:<\/strong><\/span><\/p>\n Solution 25:<\/strong><\/span><\/p>\n Chemistry<\/a>Biology<\/a>Physics<\/a>Maths<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" Frank ICSE Solutions for Class 9 Chemistry – The Periodic Table PAGE NO :132 Solution 1: The present form of periodic table has eighteen vertical columns called ‘groups’. These groups are numbered from 1 to 18. Solution 2: Seven horizontal rows in periodic table are called periods.These are numbered as 1, 2, 3, 4, 5, […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[84,6444,6442,3034],"tags":[],"yoast_head":"\n
\nSolution 1:
\n<\/strong><\/span>The present form of periodic table has eighteen vertical columns called ‘groups’. These groups are numbered from 1 to 18.<\/p>\n
\n<\/strong><\/span>Seven horizontal rows in periodic table are called periods.These are numbered as 1, 2, 3, 4, 5, 6 and 7 from top to bottom.<\/p>\n
\n<\/strong><\/span>Certain chemically similar elements are arranged into set of three elements are called triads. When these elements are arranged in order of their atomic mass, the atomic mass of the middle element is approximately average of the atomic masses of the other two.
\nFor Example – Lithium, Sodium, Potassium<\/p>\n
\n<\/p>\n\n
\n<\/strong><\/span>Important conclusions of Newland’s law of octaves are-<\/p>\n\n
\n<\/strong><\/span>The physical and chemical properties of elements are the periodic functions of their atomic masses.<\/p>\n\n
\n<\/strong><\/span>The number of elements in various periods are-
\nPeriod 1 – 2
\nPeriod 2 – 8
\nPeriod 3 – 8<\/p>\n
\n<\/strong><\/span>Hydrogen and Helium are the elements of period 1.<\/p>\n
\n<\/strong><\/span>At the end of the period 2 and period 3 the outer shell of the elements are fully filled i.e. they have complete octet.<\/p>\n
\n<\/strong><\/span>The element of group II (2) is likely to be metallic in character.<\/p>\n
\n<\/strong><\/span>Metallic character increases on moving down the group. Therefore, the element that is placed at the end of the group will have the greatest metallic character.<\/p>\n\n
\nLithium – First group and second period.
\nSodium – First group and third period.<\/li>\n
\nBeryllium – Second group and Second period
\nMagnesium – Second group and Third period<\/li>\n
\n<\/strong><\/span>Solution 15:<\/strong><\/span><\/p>\n\n
\n
\n
\nB – 2, 3
\nC – 2, 8, 2
\nD – 2, 8, 8
\nE – 2, 8, 8, 2<\/li>\n\n
\n<\/strong><\/span>Solution 19:
\n<\/strong><\/span>Merits of Mendeleev’s classification of elements are:-<\/p>\n\n
\n<\/strong><\/span>Mendeleev left some gaps in his periodic table of elements for the elements that were not discovered at that time. Though they were unknown, he was able to predict their properties more or less accurately at that time.
\nExample – He named eka-boron, eka- aluminium and eka-silicon to some elements as they were just below boron, aluminium and silicon in the respective sub-groups. Eka-boron was later named as scandium, eka-aluminium as gallium and eka-silicon as germanium.<\/p>\n
\n<\/strong><\/span>The main characteristic of the last elements in the periodic table are-<\/p>\n\n
\n
\n1 period-2
\n2 period-8
\n3 period-8
\n4 period-18
\n5 period-18
\n6 period-32
\n7 period-Incomplete<\/li>\n<\/ol>\n\n
\n
\n
\n