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The correct electronic configuration and...

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

A

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

B

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

C

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

D

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

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