Question

Atomic nber of. Elememt y is 17 wrote its configuration and what is the valency

Answer 1

Answer:

Atomic number of Y = 17

Electronic configuration of Y is = 2,8,7

Valency = 1

Explanation:

From this we can understand that the atom is Chlorine, It is under halogen family, valency of halogen family is probably 1 and the electronic configuration of Cl is 2,8,7.