How many unpaired electrons are present in the Mn²⁺ ion (Mn, Z = 25)?
Correct answer D. 5
Explanation
Mn is [Ar]3d⁵4s², so Mn²⁺ is [Ar]3d⁵. By Hund's rule the five electrons occupy the five 3d orbitals singly, giving 5 unpaired electrons.
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