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JAMB Chemistry 2012 Paper

Question : 9

Total: 45

The electronic configuration of Mg ²⁺ is

Solution:

Concept:

A positive ion is formed when an atom loses its outermost electrons.

Explanation:

Magnesium has atomic number

12

, so its neutral configuration is

1s^2\,2s^2\,2p^6\,3s^2

\mathrm{Mg}^{2+}

is formed by losing the two

3s

electrons.

Remaining configuration:

1s^2\,2s^2\,2p^6

This matches option B.

Answer:

Option B:

1s^2\,2s^2\,2p^6

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