# The pair of ions having same electronic configuration is............

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

by (-2,838 points)

(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.

by Basic (60 points)

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