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Question

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 12Mg atom=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]

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