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 (A)=35
no. of neutron (n)= 18
therefore no. of electrons or protons (atomic no. Z) =. A - n = 35-18= 17
therefore it is Cl (chlorine).
its period no. = 3
group no. = 17

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 ) .