MCQ
The pair of ions having same electronic configuration is __________.
- ACr3+, Fe3+.
- BFe3+, Mn2+.
- CFe3+, Co3+.
- DSc3+, Cr3+.
✓
Answer
- Fe3+, Mn2+.
Explanation:
Cr3+ (Z = 24) = [Ar]3d3
Fe3+ (Z = 26) = [Ar]3d5
Mn2+ (Z = 25) = [Ar]3d5
Co3+ (Z = 27) = [Ar]3d6
Sc3+ (Z = 21) = [Ar]3d0
Fe3+ and Mn2+ will have the same number of electrons, i.e., 23 and, hence, have the same electronic configuration.
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