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The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here are not the chemical symbols of the elements): (i) Which element has a bigger atom, a or ƒ ? (ii)Which element has a higher valency, k or o? (iii) Which element is more metallic, i or k? (iv) Which element is more non-metallic, d or g? (v) Select a letter which represents a metal of valency 2. (vi) Select a letter which represents a non-metal of valency 2. Lakhmir Singh Chemistry Class 10 |
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Answer» Explanation:The DIAGRAM for the same REPRESENTS the table as - a - 3 b - 4 c -5 d - 6 e - 7 f - 8 g - 9 h -10 i - 11 j- 12 K - 13 l - 14 m - 15 n - 16 o - 17 p - 18 (i) Element one has the larger atom. In the periodic table, the element's atomic radius reduces as it moves in a period from left to right.(ii) k has a higher valency.ELECTRONIC configuration of k : K L M - 2 8 3Thus, the valency for k = valence electron of K = 3Electronic configuration of o: K L M - 2 8 7Thus the, valency for o = 8 - valence electron of o = 8 - 7= 1(iii) Element I is more metallic since I belong to the periodic table's left side and group 1. The metallic character reduces when moving from left to right in a period.(iv) Element g is more non-metallic, as the non-metallic character rises in a period when it moves from left to right.(v) Elements b or j components are metals with a 2 valence as they have 2 valence electrons and are put on the left side of the periodic table.(vi) The elements f or n are metals with a valency of 2 .Electronic configuration of f : K L - 2 6 Valency of f = 8 - valence electron = 8 - 6 = 2Electronic configuration of n : K L M - 2 8 6Valency of n = 8 - valence electron= 8 - 6 = 2 |
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