Question

An element x has mass no. 35 and the no. Of neutrons is 18 .identify the group no. And period of x.

Answer 1

35 =x+18
x=17.
group no 17. period -3
name Chlorine

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 ) .