JAMB Chemistry 2012 Objective — Question 10

Question 10 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2012 Objective paper, with the correct answer and a full explanation.

The electronic configuration of Mg²⁺ is

A. 1s²2s²2p⁶3s²3p2
B. 1s²2s²2p⁶3s²
C. 1s²2s²2p⁶Correct
D. 1s²2s²2p⁴

Explanation

Magnesium (Mg) has electron configuration 1s²2s²2p⁶3s². Losing two electrons to form Mg²⁺ gives 1s²2s²2p⁶.

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