Question

How does valency of elemnets change moving left to right in the second period of a periodic table?

Answer 1

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Valency of elements on moving left to right in second period, first increases uptill 4th group and then decreases to one.
eg- Li<Be<B<C. N>O>F..

Answer 2

Answer:

It goes like this : 1 2 3 4 3 2 1 0

Explanation:

Across the period the no of valence electrons increases but valency of elements with respect first increases from 1 to 4 and then decreases to zero.