Which of the following has 6 unpaired f-elect | vedclass

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(D) To find the number of unpaired $f-$electrons,we write the electronic configuration of the lanthanide ions:$1$. $Tm^{+3} (Z = 69)$: The neutral $Tm

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$Tb^{+3} (Z = 65)$

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(D) To find the number of unpaired $f-$electrons,we write the electronic configuration of the lanthanide ions:$1$. $Tm^{+3} (Z = 69)$: The neutral $Tm$ is $[Xe] 4f^{13} 6s^2$. $Tm^{+3}$ is $[Xe] 4f^{12}$. In $4f^{12}$,there are $2$ unpaired electrons.$2$. $Nd^{+3} (Z = 60)$: The neutral $Nd$ is $[Xe] 4f^4 6s^2$. $Nd^{+3}$ is $[Xe] 4f^3$. In $4f^3$,there are $3$ unpaired electrons.$3$. $Dy^{+3} (Z = 66)$: The neutral $Dy$ is $[Xe] 4f^{10} 6s^2$. $Dy^{+3}$ is $[Xe] 4f^9$. In $4f^9$,there are $5$ unpaired electrons.$4$. $Tb^{+3} (Z = 65)$: The neutral $Tb$ is $[Xe] 4f^9 6s^2$. $Tb^{+3}$ is $[Xe] 4f^8$. In $4f^8$,there are $6$ unpaired electrons.Thus,$Tb^{+3}$ has $6$ unpaired $f-$electrons.

Which of the following has $6$ unpaired $f-$electrons?

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