Question

an element has mass number. 35 and the number of neutrons is 18 identify the group number and periodic of element

Answer 1

Element=Chlorine
Group no.=17
Period no=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 ) .