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Which of the following free gaseous ions...

Which of the following free gaseous ions of 3d elements has the highest paramagnetic moment ? (The atomic numbers of Mn ,Fe, Ni, and Cu are 25, 26 ,28 and 29 respectively )

A

`Ni^(2+)`

B

`Mn^(2+)`

C

`Fe^(2+)`

D

`Cu^(2+)`

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