• # question_answer The value of the 'spin only' magnetic moment for one of the following configurations is 2.84 BM. The correct one is A) ${{d}^{5}}$ (in strong ligand field) B) ${{d}^{3}}$ (in weak as well as in strong fields) C) ${{d}^{4}}$(in weak ligand fields) D) ${{d}^{4}}$(in strong ligand fields)

 ${{d}^{5}}$strong ligand field ${{d}^{5}}$ $\mu =\sqrt{n\left( n+2 \right)}=\sqrt{3}=1.73\operatorname{BM}$ ${{d}^{3}}$in weak as well as in strong field ${{d}^{3}}$
 $\mu =\sqrt{3\left( 5 \right)}=\sqrt{15}=3.87\operatorname{BM}.$ ${{d}^{4}}$In weak ligand field ${{d}^{4}}$ $\mu =\sqrt{4\left( 8 \right)}=\sqrt{24}=4.89\operatorname{B}.M.$ ${{d}^{4}}$ In strong ligand field ${{d}^{4}}$ $\mu \sqrt{2\left( 4 \right)}=\sqrt{8}=2.82\operatorname{B}.M.$