Identify the actinoid element that exhibits the absolute maximum theoretically possible oxidation st — d and f Block Elements Chemistry Question

💡 Solution & Explanation

While Thorium only reaches $+4$, and Uranium reaches $+6$ (in $UF_6$ or $UO_2^{2+}$), the elements immediately following Uranium, specifically Neptunium ($Np$) and Plutonium ($Pu$), have enough available valence electrons in their comparable $5f, 6d, 7s$ orbitals to achieve an absolute maximum oxidation state of $+7$.