How do you calculate the valency of an element from its electronic con

1.	How do you calculate the valency of an element from its electronic configuration
Answer» If no. Of electron in outer shell is 5,6,7 then valency = 8 - no. of electron of outer shell .If no. Of electron in outer shell is 1,2,3 then valency = no. Of electron in outer shell. If no. Of electron in outer shell is 4 then element will be metalloid

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