Question

14. How does the number of valence electrons vary on
moving from left to right:
(a) in Period first and (b) in second period ​

Answer 1

Answer:

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Answer 2

Answer:

Valence electrons in the same shell (outermost shell) increase progressively by one across the period. The first element of sodium has one valence electron and magnesium has two valence electrons. On moving from left to right in the third period, valency increases from 1 to 7 and ultimately to zero in the last group.

Explanation:

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