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(B) The electronic configuration of $Zn$ $(Z=30)$ is $[Ar] 3d^{10} 4s^2$.In transition elements,variable oxidation states arise due to the participati

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completion of $(n-1)d$ orbitals

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(B) The electronic configuration of $Zn$ $(Z=30)$ is $[Ar] 3d^{10} 4s^2$.In transition elements,variable oxidation states arise due to the participation of both $(n-1)d$ and $ns$ electrons in bonding.Since $Zn$ has a completely filled $3d$ subshell $(3d^{10})$,the $d$-electrons are stable and do not participate in chemical bonding.Therefore,$Zn$ only exhibits a $+2$ oxidation state by losing its two $4s$ electrons,failing to show variable oxidation states.

Transition elements are usually characterised by variable oxidation states,but $Zn$ does not show this property because of:

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