Question
Chemistry Question on Structure of atom
The electronic configuration of a dipositive ion M2+ is 2,8,14 and its mass number is 56. The number of neutrons present is
A
32
B
42
C
30
D
34
Answer
30
Explanation
Solution
Number of electrons in M2+=24 ∴ number of electrons in M=26 i.e., atomic number (Z)=26 Mass number (A)=56 ∴ number of neutrons =A−Z=56−26=30 .