Question

An element X has most number 35 and the number of neutrons is 18 identify the group number and period of x

Answer 1

Mass number = 35
Number of neutrons= 18
Atomic number = Mass number - Number of neutrons
Atomic number = 35-18 = 17

This clearly has indicated that the element is Chlorine(Cl).

Group number can be found by looking at its atomic number, which is 17 and hence is in group 17.

Period can be found by checking the number of shells in chlorine which are 3 and hence it is in 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 ) .