Question

how to find valency?
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Answer 1

Answer:Write down the electrinic configuration of the compound

if the ottermost shell has 1or 7 electons the valancy is 1

If it has 2 or 6 electrons the valancy is 2.....an so on....

Explanation:hope it helped you......

Answer 2

Answer:

First notice the valence electron of the element.

then check what would be easy for it gaining the electron or losing the electron.

For ex - Chlorine

Atomic no.-17

For chlorine gaining an electron is much easier than losing 7 electron.

So it's valency is -1.

Similarly for sodium

atomic no. -11

it is easier for sodium to lose 1 electron to complete it's octate.

So valency of sodium is +1. This is how Valency is determined.