Question

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

Answer 1

Sodium

group- 1

period- 3
hope it helps:)

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 ) .