Question

An element x has mass number 35 the number of neutron is 18 identify the group number period pf x

Answer 1

atomic no. (no. of proton) = mass no. - no. of neutron
35-18 = 17 which is chlorine

group 17 (halogens), period 3

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 ) .