Question

define valency of an element in short

Answer 1

Valency is the number of electron in valence shell

Answer 2

1s2 /2s2 2p6 is the valency of the element ne
means 2,8 . 8 is the valency of the number
1s2 2s2 2p6 3s2 /4s2
4s2 is the valency
do for chlorine 1s2 2s2 2p6 3s2 4s2 3d3 valency number is 5 .3s2+3d3=2+3=5
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