Question

How does the valency electron vary in going down a group? ​

Answer 1

Answer:

on moving from left to right in the periodic table valency increase up to 4 and then decrease upto because of the electron increase by 1 whereas the volume of valency shall remain the same

Explanation:

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Answer 2

Answer:

On moving from left to right on the periodic table,valency increases up to 4 and then decreases.On moving across the periodic atomic size decreases because of the electron increases by 1 whereas,the number of valency shell remains the same.Therefore as a result of an increase in nuclear change,atomic radius decreases