Question

The actinoids showing $+7$ oxidation state are

• A. $U$, $Np$
• B. $Pu$, $Am$
• C. $Np$, $Pu$
• D. $Am$, $Cm$

Answer 1

Answer: (C)

$Np$ and $Pu$ in $[Np{O}_6{]}^{5-}$ and $[Pu{O}_6{]}^{5-}$ oxoanions show $+7$ oxidation states which are not so stable.