Question

How to find valency of elements easily

Answer 1

Answer:

Valency is the count of electrons required to obtain octet configuration.

So by knowing the atomic configuration one can easily find its valency.

For example:

Consider Chlorine(Cl):

Its config is : 1s²2s²2p⁶3s²3p⁵

As 3p⁶ is closest octet configuration, So Cl⁻ is formed.

There for its valency is -1

Explanation:

Answer 2

Answer:

just see there outer orbit or valence electrons numbers then calculate how much it will accept or realese if the element accept electron it will be regarded as non metal if it realese elements it regarded as metal