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  • Identify the Mg^{2+} ion from the figure where, n and p represent the number of neutrons and protons respectively.

Identify the Mg^{2+} ion from the figure where, ''n'' and ''p'' represent the number of neutrons and protons respectively.

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Answer: D

The atomic number (Z) of magnesium is 12 and

the mass number (A) is 24 \left ( p = 12 \; and \; n = A - Z = 24 - 12 = 12 \right ).

The electronic configuration of Mg atom is 2, 8, 2.

So, the electronic configuration of Mg^{2+} ion is 2, 8 (the positive charge is acquired from the loss of 2 electrons).

 

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