Question

An element x has mass no 35 and the no of neutrons is 18. Identify the group number and period of x

Answer 1

the answer to the question is argon.

Answer 2

Answer:

We know :

Atomic number = Mass number - No. of neutrons.

Atomic number = 35 - 18

= > 17

Electronic configuration :

2 , 8 , 7

Group no. = 17

Period no. = 3

Name of element is Chlorine (  Cl ) .