Question

an element x belongs to group 17 and third period of periodic table.

1.what is the valency of the element and write the electronic configeration of the element

2.predict its nature whesther it is a metal or a non metal

3.give the formula of the com[ound formed when it combines with y having valency 3

Answer 1

1. element is chlorine with valency 1.
electronic configuration is 2 , 8 , 7.
2. it is non metal.