Question

The electronic configuration of a dipositive ion `M^(2+)` is 2, 8, 14 and its atomic mass is 56. what is the number of neutrons in its nucleus ?
A. 30
B. 32
C. 34
D. 42

Answer 1

Correct Answer - A
Metals is `._26M^(2+)` (2,8,14) then the electronic configuration of metal would be 56M (2,8,16)
Total no. of electron =2+8+16=26 and n=A-Z =56-26=30