Question

how to find out the valency of a compound?​

Answer 1

write Electronic Configuration...

for example

Na (atomic number 11)

K shell - 2 fully filled

L shell - 8 fully filled

M shell - 1

So from M shell it can easily loose 1 electron..

So it's valency is 1..

sometimes group number also help you to find valency

Answer 2

Valency is combining capacity of an element.To know the valency of a given element firstly u need to know about the electronic configuration of the given element..4 EXample, given element is oxygen ,nd we have to find its valency,foremost we will see it's electronic configuration, since it contains 8 electrons it's electronic configuration will be 2,6 and it needs two more electrons to complete it's octet..it Will have to form covalent or ionic bond to satisfy it's valency..
I tried my best...HOPE it helps uh ☺