Which of the following has a maximum number of unpaired electrons? Mg2+Ti3+Fe2+Cu2+​

Answers (1)

Mg2+   4s0 3d5   5 unpaired

Ti3+     4s0 3d2   2 unpaired

Fe2+    4s0 3d6   4 unpaired

Cu2+​   4s0 3d9   1 unpaired

So, Mn2+ is the answer.

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