Question

The element A has an atomic number of 17.

1) The electron configuration of A is :-
2) The valency of the non-metal A is :-
3) The valence electrons :-

(Pleas give exact answer :)

Answer 1

electronic configuration =2,8,7
valency =-1
valence electron =1

Answer 2

1.) It's electronic configuration is 2,8,7.
2.) The valency of the non metal is -1.
3.) The no. of valence electrons in it are 7.

So, the element is CHLORINE.