How does valence of an element vary along the period and group?
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No change along group, as the number ofvalence electrons remains same in theelements along a group. Valency vary alonga period, as the number of valence electronschange along the period.
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in period first it increases and then decreases
from left to right
in group there is no change of valencey
from left to right
in group there is no change of valencey
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