Which one of the following has the least magnetic moment ?
Which one of the following has the least magnetic moment ?
A. `Cu^(2+)`
B. `Ni^(2+)`
C. `Co^(2+)`
D. `Fe^(2+)`
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Correct Answer - A
`Cu^(2+) to [Ar] 4s^0 3d^9` , only one unpaired `e^-` in 3d orbital
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