The set that contains the atomic numbers of o | vedclass

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Question

(B) Transition elements are defined as elements which have incompletely filled $d$-orbitals in their ground state or in any of their oxidation states.

Vedclass · Accepted Answer

$21, 25, 42, 72$

Vedclass · Answer

(B) Transition elements are defined as elements which have incompletely filled $d$-orbitals in their ground state or in any of their oxidation states.These include elements with atomic numbers:$21-30$ (first transition series),$39-48$ (second transition series),$57$ and $72-80$ (third transition series),$89$ and $104-112$ (fourth transition series).In the given set $21, 25, 42, 72$:$21$ $(Sc)$,$25$ $(Mn)$,$42$ $(Mo)$,and $72$ $(Hf)$ are all transition elements.Therefore,the correct set is $21, 25, 42, 72$.

The set that contains the atomic numbers of only transition elements is -

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