Which of the following elements are included | vedclass

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$(A)$ The transition series are categorized based on the filling of $d$-orbitals: $1$. First transition series: $3d$ series ($Sc$ to $Zn$). $2$. Secon

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$Ac, Rf$

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$(A)$ The transition series are categorized based on the filling of $d$-orbitals: $1$. First transition series: $3d$ series ($Sc$ to $Zn$). $2$. Second transition series: $4d$ series ($Y$ to $Cd$). $3$. Third transition series: $5d$ series ($La, Hf$ to $Hg$). $4$. Fourth transition series: $6d$ series, which starts from $	ext{Actinium}$ ($Ac$, atomic number $89$) and continues with $	ext{Rutherfordium}$ ($Rf$, atomic number $104$). Therefore, $Ac$ and $Rf$ are the elements included in the fourth transition series.

Which of the following elements are included in the fourth transition series?

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