Question

What is valeney?
write the valency of
Na, cl​

Answer 1

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell. Group number.

We know that the valency of sodium (Na) is +1 and Chlorine (Cl) is -1. Both sodium and chlorine have to gain one electron and lose one electron respectively to achieve stable outermost orbit. Therefore, sodium donates an electron and chlorine accept the same electron.

Answer 2

Valency is the number of electrons present in the outermost shell of an element

Na valency = 1
Cl valency = 1