Question

an element X has mass number 14 and number of neutron 8 right atomic number and electronic configuration of X also write group number period and valency of x

Answer 1

Atomic no. = mass no. - no. of neutron
=14 - 8
= 6
Electronic configuration : 2,4
Group no : 4
Period: 2
Valency:4
Hope it will help u✌

Answer 2

let the no. of boys be x
2/5 of x +x=35
7x/5=35
x=35×5/7
x=25
therefore the no of boys=25
and girls=10