Question

An element ''X" has mass no. 35 and no. of neutrons is 18. Identify the group no. & period of "X"

Answer 1

The element is CHLORINE.
Protons-17
Electrons-17
Neutrons-18
Atomic number-17
Mass number-35
Valency-1

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 ) .