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in Class XI Chemistry by Premium (539 points)

The pair of ions having same electronic configuration is............
(a) Cr3+,Fe3+
(b) Fe3+,Mn2+
(c) Fe3+,Co3+
(d) Sc3+,Cr3+ 

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2 Answers

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(b) 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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by Basic (60 points)

Fe3+ and Mn2+ will have the same number of electrons, i.e.,23 and, hence, have the same electronic configuration.

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