A lanthanoid has n unpaired electrons and ano | vedclass

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(C) The number of unpaired electrons in a lanthanoid ion is determined by the $4f$ orbital configuration. For a lanthanoid with $n$ unpaired electrons

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Both $(A)$ and $(B)$

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(C) The number of unpaired electrons in a lanthanoid ion is determined by the $4f$ orbital configuration. For a lanthanoid with $n$ unpaired electrons,the electronic configuration of the $4f$ subshell is $f^n$. For a lanthanoid with $(14-n)$ unpaired electrons,the electronic configuration is $f^{14-n}$. According to the principle of electronic configuration in $f$-orbitals,an $f^n$ configuration and an $f^{14-n}$ configuration have the same number of unpaired electrons. For example,$f^1$ and $f^{13}$ both have $1$ unpaired electron,and $f^2$ and $f^{12}$ both have $2$ unpaired electrons. Since both have the same number of unpaired electrons,they exhibit the same magnetic behaviour (paramagnetism) and the same colour due to $f-f$ transitions.

$A$ lanthanoid has $n$ unpaired electrons and another lanthanoid has $(14-n)$ unpaired electrons. It means:

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