In which of the f-block elements is the numbe | vedclass

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(C) The electronic configuration of the given elements is as follows:$Ce$ $(Z=58)$: $[Xe] 4f^1 5d^1 6s^2$. Here,the $(n-2)f$ subshell is $4f$,which co

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$Th$

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(C) The electronic configuration of the given elements is as follows:$Ce$ $(Z=58)$: $[Xe] 4f^1 5d^1 6s^2$. Here,the $(n-2)f$ subshell is $4f$,which contains $1$ electron.$U$ $(Z=92)$: $[Rn] 5f^3 6d^1 7s^2$. Here,the $(n-2)f$ subshell is $5f$,which contains $3$ electrons.$Th$ $(Z=90)$: $[Rn] 5f^0 6d^2 7s^2$. Here,the $(n-2)f$ subshell is $5f$,which contains $0$ electrons.Therefore,$Th$ is the element where the number of electrons in the $(n-2)f$ subshell is zero.

In which of the $f$-block elements is the number of electrons in the $(n-2)f$ subshell zero?

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