1.

Which of the following has maximum number of unpaired electrons?

Answer»

<P>`CU^(2+)(Z=29)`
`Fe^(3+)(Z=26)`
`Fe(Z=26)`
`P(Z=15)`

Solution :`Cu^(2+),[Ar]3D^(9),`
`Fe^(3+):[Ar]3d^(5)` `P:[Ne]3s^(2)3p^(3)`
`Fe^(3+)`has maximum (five) unpaired electrons.


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