Question 10 Identify the Mg2+ ion from the figure where, n and p represent the number of neutrons and protons respectively.
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Solution
The answer is (d). Electronic configuration 12Mgatom=2,8,2 and that of Mg2+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]