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Which of the following ions has an electron configuration...

Which of the following ions has an electron configuration different from the other?

A.

₁₇CI^-

B.

₈O^2-

C.

₁₂Mg²⁺

D.

₁₃AI³⁺

View answer & explanation

Correct answer is A

$_{17}$ Cl $^-$ = 18 electrons = 2, 8, 8

$_{12}$ Mg $^{2+}$ , $_{8}$ O $^{2-}$ and $_{13}$ Al $^{3+}$ all have 10 electrons = 2, 8.

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