Question 10
Identify the $M g^{2 +}$ 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 $_{12} M g a t o m = 2, 8, 2$ and that of $M g^{2 +} i o n = 2, 8$
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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Mass Number and Representation of Atom

Standard IX Chemistry

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Question 10 Identify the Mg2+ ion from the figure where, n and p represent the number of neutrons and protons respectively.

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]

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

The answer is (d).
Electronic configuration $_{12} M g a t o m = 2, 8, 2$ and that of $M g^{2 +} i o n = 2, 8$
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]