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  • The correct electronic configuration and spin-only magnetic moment (BM) of  respectively, are :Option:

The correct electronic configuration and spin-only magnetic moment (BM) of \mathrm{Gd}^{3+}(\mathrm{Z}=64), respectively, are :
Option: 1 \text { [Xe] } 4 \mathrm{f}^{7} \text { and } 8.9
Option: 2 \text { [Xe] } 4 \mathrm{f}^{7} \text { and } 7.9
Option: 3 \text { [Xe] } 5 \mathrm{f}^{7} \text { and } 8.9
Option: 4 \text { [Xe] } 5 \mathrm{f}^{7} \text { and } 7.9

Answers (1)

best_answer

Electronic configuration of \mathrm{Gd}^{3+} \text { is }{ }_{64} \mathrm{Gd}^{3+}=[\mathrm{Xe}] 4 \mathrm{f}^{7} 

Gd3+ has 7 unpaired electrons and the magnetic moment is given as 

Magnetic moment  ({\mu})=\sqrt{\mathrm{n}(\mathrm{n}+2)} \mathrm{B.} \mathrm{M.}

Where n = number of unpaired electrons.

So, 

\mu=\sqrt{7(7+2) } = 7.9\ \mathrm{B.} \mathrm{M.}

Therefore, the correct option is (2).

Posted by

Kuldeep Maurya

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