Identify the `Mg^(2+)` ion from the figure where, n and p represent the number of neutrons and protons respectively.

Options

A.
B.
C.
D.

Answer

D

Explanation

Electronic configuration `""_(12)Mg` atom `= overset(K)2, overset(L)8, overset(M)2` and that of
`Mg^(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]
Therefore, option (d) is the correct answer.