Answer :

When atomic no. is 2 then the valency shown by A – 0

When atomic no. is 4 then the valency shown by B - 2


When atomic no. is 8 then the valency shown by C - 2


When atomic no. is 10 then the valency shown by D - 0


When atomic no. is 13 then the valency shown by E - 3


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