Which among the following ions contain maximum number of unpaired electrons ? (At. No. Cr = 24, Ni=28, Sc=21 , Z=30)
Which among the following ions contain maximum number of unpaired electrons ? (At. No. Cr = 24, Ni=28, Sc=21 , Z=30)
A. `Cr^(+3)`
B. `Ni^(+2)`
C. `Sc^(+2)`
D. `Zn^(+2)`
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Correct Answer - A
Electronic configuration of these ion is
`{:(Cr^(+3), 2"le"^(-) 4s^0 3d^3,"3 unpaired electrons"),(Ni^(+3), 26e^(-) 4s^0 3d^8, "2 unpaired electrons"),(Sc^(+2), 19e^(-) 4s^0 3d^1, "1 unpaired electrons"),(Zn^(+2), 28e^(-) 4s^0 3d^0 , "0 unpaired electrons"):}`
Therefore `Cr^(+3)` ion has maximum number of unpaired electrons
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