Question

how will you find the valency of chlorine Sulphur and magnesium

Answer 1

Outermost shell of chlorine has 7 electrons so it will need one more electron to complete its octate valency of chlorine is 1-

Outermost shell of sulphur has 6 electrons so it will need 2 more electron to complete its octate valency of sulphur is 2 -

Outermost shell of magnesium has 2 electrons and it has to give two electrons to complete its octate
valency of magnesium is 2+


hope it helps

Answer 2

hello !

chloride = electronic configuration = 2, 8, 7

1 electron gained to complete its octet

so its valency is 1.

sulphur = electronic configuration = 2, 8, 6

2 electrons gained to complete its octet

so its valency = 2

magnesium =  It has electronic configuration = 2, 8, 2

it can lose two electrons attain octet

so its valency = 2