1.

Which one of the following shows highest magnetic moment?

Answer»

`FE^(2+)`
`Co^(2+)`
`Cr^(3+)`
`Ni^(2+)`.

Solution :Larger the number of unpaired electrons, HIGHER is the magnetic moment.
No. of unpaired electrons:
`Fe^(2+):[Ar]3d^(6)=4`
`Co^(2+):[Ar]3d^(7)=3`
`Cr^(3+):[Ar]3d^(3)=3`
`Ni^(2+):[Ar]3d^(8)=2`


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