Question

I tried many time to find the valancy but all time ido mistake please explain me step by step how to find valency of element with example

Answer 1

number of valence electron in outermost shell is the valency of electron. for example electronic configuration of carbin is (2,4) that means the valency of carbon is 4

Answer 2

for example carbon has 6 atomic number then the valency = 8-4 = 4 because if the in the last she'll the number is greater than the 4 we mins it from 8.
magnesium has 12 atomic number then the valency is 2 because in the last she'll has 2 no.