1.

The valency of the elements of period​

Answer»

On moving from LEFT to right in a period, the number of valence electrons decreases from 8 to 1. - As a RESULT, VALENCY ACROSS a period first increases and then decreases. - Valency increases from +1, +2, +3 till +4 in a period and then decreases -4, -3, -2, -1, 0.



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