What are the outermost d-orbitals for the sec | vedclass

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(A) The transition elements are classified into four series based on the filling of $d$-orbitals: $1$. First transition series involves the filling of

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$4d$ and $5d$

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(A) The transition elements are classified into four series based on the filling of $d$-orbitals: $1$. First transition series involves the filling of $3d$-orbitals ($Sc$ to $Zn$). $2$. Second transition series involves the filling of $4d$-orbitals ($Y$ to $Cd$). $3$. Third transition series involves the filling of $5d$-orbitals ($La$ and $Hf$ to $Hg$). $4$. Fourth transition series involves the filling of $6d$-orbitals. Therefore,the second transition series corresponds to $4d$-orbitals and the third transition series corresponds to $5d$-orbitals.

What are the outermost $d$-orbitals for the second and third transition series,respectively?

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