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

mass number=35

neutrons=18

so protons=35-18=17

so the element is chlorine and it is in group number 17 period number 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 ) .