Question

Explain
valency of an element​

Answer 1

the capacity of an element to combine with another element in order to form compound is called valency

Answer 2

I will take a example and tell you

1. let's take example of nitrogen it's electronic configuration is 1s2 2s2 2p3
2. now see the last shell 2s2 2p3 it belongs to 2 orbit ,so 3+2 is 5 and subtract it from 8
3. therefore the valency is 3