Which of the following ions has the maximum number of unpaired d- electrons ?
Which of the following ions has the maximum number of unpaired d- electrons ?
A. `Fe^(+3)`
B. `Fe^(+2)`
C. `Co^(+2)`
D. `Co^(+3)`
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Correct Answer - A
Electronic configuration of Fe (26) is `3d^6 4s^2` and that of Co (27) is `3d^7 4s^2`
Therefore electronic configuration of the ions are :
`{:(Fe^(+3) ,3d^5 4s^0 ,"5 unpaired " e^-,"(Maximum)"),(Fe^(+2),3d^6 4s^0 ,"4 unpaired " e^- ,),(Co^(+2),3d^6 4s^0 ,"4 unpaired " e^-,),(Co^(+3),3d^6 4s^0,"4 unpaired" e^-,):}`
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