Question

An element x has mass number 35 and the number of neutrons is 18 identify the group number and period of x

Answer 1

We knows that
Mass no. =No. Of proton +no. Of Neutrons
So
35=Proton+18
Protons=17
So name of the element Clorine.
And this is P block element.
And group no. =17
I think it will help you

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 ) .