Question

Question 10
Identify the $M{g}^{2+}$ ion from the figure where, n and p represent the number of neutrons and protons respectively.

Answer 1

The answer is (d).
Electronic configuration ${}_{12}Mgatom=2,8,2$ and that of $M{g}^{2+}ion=2,8$
Number of protons in Mg atom = 2 + 8 + 2 = 12
Number of neutrons in Mg atom = 24 -12 = 12
[as mass number of Mg atom = 24 and number of neutrons = mass number — number of protons]