What happens to the number of valency electrons as we move down in a group and left to right in a period?

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Solution

Valency and number of valence electrons remains the same on going down the group.
Valency first increases on going left to right along a period and then decreases while the number of valence electrons keep on increasing.

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What happens to number of valence electrons in atoms of elements as we go down a group of the periodic table ?

(a) What are the usual number of valence electrons and valency of group 18 elements of the periodic table?

(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?

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