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Question
How does number of (i) valence electrons (ii) valency; vary on moving from to right:
(a) in the second period of a periodic table ?
(b) in the third period of a periodic table ?
(a) in the second period of a periodic table ?
(b) in the third period of a periodic table ?
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Solution
a)
On moving from left to right in the second
period, the number of valence electrons increases from 1 (Li) to 8 (Ne), whereas
the valency increases from 1 (Li) to 4 (C) and then decreases from 4 to 0 (Ne).
b)
Similarly, in third period the number of
valence electrons increases from 1 (Na) to 8 (Ar) i.e., from left to right, whereas
the valency increases from 1 (Na) to 4 (Si) and then decreases from 4 to 0 (Ar).
a) On moving from left to right in the second period, the number of valence electrons increases from 1 (Li) to 8 (Ne), whereas the valency increases from 1 (Li) to 4 (C) and then decreases from 4 to 0 (Ne).
b) Similarly, in third period the number of valence electrons increases from 1 (Na) to 8 (Ar) i.e., from left to right, whereas the valency increases from 1 (Na) to 4 (Si) and then decreases from 4 to 0 (Ar).
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