Question

how does the valency of elements vary. 1) In going from a group .2) In going from left to right in a period​

Answer 1

Answer:

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Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.

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Answer 2

Answer:

Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.