Question

An element 'x' has mass number 35 and number of neutrons 18 write atomic number and elecrtronic configuration of x also write group number, period number and vanlency of x

Answer 1

Atomic number=17
electronic configuration=2,8,7
group no.=17
period no.=3
valency=1

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

Valency = - 1 .

Name of element is Chlorine (  Cl ) .