(D) The highest oxidation state in plutonium (Atomic number = $94$) is $+7$. This is because the $5f$,$6d$,and $7s$ energy levels have comparable ener

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(D) The highest oxidation state in plutonium (Atomic number = $94$) is $+7$. This is because the $5f$,$6d$,and $7s$ energy levels have comparable energies,allowing for a wide range of oxidation states. Plutonium $(Pu)$ exhibits oxidation states of $+3$,$+4$,$+5$,$+6$,and $+7$ in its various compounds.