Which element from following is NOT considered as transition element on the basis of electronic configuration?

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Transition elements are defined as elements having incompletely filled d-orbitals in their ground state or in any of their common oxidation states.

The electronic configuration of Hg is [Xe] $4 f^{14} 5 d^{10} 6 s^{2}$ . In its ground state as well as in its common oxidation states (+1, +2), the d-orbitals are completely filled ( $5 d^{10}$ ). Therefore, Hg is not considered a transition element.

Ti ([Ar] $3 d^{2} 4 s^{2}$ ) and V ([Ar] $3 d^{3} 4 s^{2}$ ) have incompletely filled d-orbitals in their ground states.

Ag ([Kr] $4 d^{10} 5 s^{1}$ ) has an incompletely filled d-orbital in its +2 oxidation state ( $4 d^{9}$ ), so it is considered a transition element.

Answer: Hg

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