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The correct electronic configuration and spin only magnetic moment \(( BM )\) of \(Gd ^{3+}( Z =64)\), respectively, are…

Q1

The correct electronic configuration and spin only magnetic moment \(( BM )\) of \(Gd ^{3+}( Z =64)\), respectively, are:

[JEE Main 2020, 5 Sep (Shift 1)]

a

\([ Xe ] 4 f ^7\) and 7.9

b

\([ Xe ] 4 f ^7\) and 8.9

c

\([ Xe ] 5 f ^7\) and 8.9

d

\([ Xe ] 5 f ^7\) and 7.9

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