Which of the following elements is NOT regard | vedclass

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(D) transition element is defined as an element which has an incompletely filled $d$-orbital in its ground state or in any one of its oxidation states

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$Hg$

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(D) transition element is defined as an element which has an incompletely filled $d$-orbital in its ground state or in any one of its oxidation states. $Ni$ $(3d^8 4s^2)$,$Fe$ $(3d^6 4s^2)$,and $Ag$ ($4d^{10} 5s^1$ in ground state,but $Ag^{2+}$ has $4d^9$) are considered transition elements. $Hg$ $([Xe] 4f^{14} 5d^{10} 6s^2)$ has a completely filled $d$-orbital in its ground state $(5d^{10})$ and also in its common oxidation state ($Hg^{2+}$ is $5d^{10}$). Therefore,$Hg$ is not regarded as a transition element.

Which of the following elements is $NOT$ regarded as a transition element?

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