Which of the following systems in an octahedr | vedclass

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(D) In an octahedral complex,the $d$-orbitals split into $t_{2g}$ and $e_g$ levels.For $d^9$ (high spin): $t_{2g}^6 e_g^3$,number of unpaired electron

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$d^7$ (high spin)

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(D) In an octahedral complex,the $d$-orbitals split into $t_{2g}$ and $e_g$ levels.For $d^9$ (high spin): $t_{2g}^6 e_g^3$,number of unpaired electrons $(n)$ = $1$.For $d^6$ (low spin): $t_{2g}^6 e_g^0$,$n = 0$.For $d^4$ (low spin): $t_{2g}^4 e_g^0$,$n = 2$.For $d^7$ (high spin): $t_{2g}^5 e_g^2$,$n = 3$.Therefore,the $d^7$ (high spin) system has the maximum number of unpaired electrons.

Which of the following systems in an octahedral complex has the maximum number of unpaired electrons?

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