Question

How to calculate the valency of elements ??

Answer 1

Explanation:

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.

Answer 2

You have studied about the shells of an atom K, L, M, N

K = 2 electrons

L = 8 electrons

M = 8 electrons

if you have to calculate the valency of Ca(calcium).

atomic no of Ca = 20

K = 2

L = 8

M = 8

N= 2

here the N shell has 2 electrons left,

then it will be easy for it to lose two electrons but it will be difficult to gain 6 electrons .

So, valency would be 2.

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