Question

how will you find the valency of an element

Answer 1

The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.
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Answer 2

currency of any element is equal to the number of electrons in its outer shell. if that number is four or less.


just take a example: like as( c-atom)
. total number of electrons are -6
than write the electric configuration : - 2 ,4
than outer shall have 4 electrons .
than valancy of carbon is four .

it means carbon has tetravalent