Which of the following actinoids show oxidation states up to +7 ?
I. Pu II. Am III. U IV. Np
The correct option is

The oxidation states of the following actinoids are
(a) Americium (Z = 95), Electronic configuration =  $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{7}6{\mathrm{d}}^{0}7{\mathrm{s}}^2$
Oxidation states shown by Am = + 3, + 4, + 5, + 6.
(b) Plutonium (Z = 94), Electronic configuration =    $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{6}6{\mathrm{d}}^{0}7{\mathrm{s}}^2$
Oxidation states shown by Pu = + 3, + 4, + 5, + 6, 7.
(c) Uranium (Z = 92), Electronic configuration =     $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{3}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$
Oxidation states shown by U = + 3, + 4, + 5, + 6.
(d) Neptunium (Z = 93), Electronic configuration =  $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{4}6{\mathrm{d}}^{1}7{\mathrm{s}}^2$
Oxidation states shown by Np = + 3, + 4, + 5, + 6, + 7.