Question

How to calcute valancy

Answer 1

First we have to know the atomic configuration of the element.

Then note how much electrons in outer shell.

If it is 1,2,3,4 then it itself will be the valency .

If it's more than 5 subtract the number of electrons from 8 as maximum number of electrons in the outer shell will be 8.

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Answer 2

BY ELECTRONIC CONFIGURATION .....

IN OUTERMOST SHELL ELECTON SHOULD BE 8 SO IF NO OF ELECTRON IS LESS THAN OR MORE THAN 8 .BY SUBTRACTING IT FROM 8