Discussion
Which of the following pair of actinoids exhibit maximum oxidation state of +7?
Answer: E
The pair is Np and Pu.
Among the actinoids, the maximum oxidation state rises from thorium (+4) through protactinium (+5) and uranium (+6) to neptunium and plutonium, which reach +7, and then falls again. Americium reaches about +6, and the later actinoids are mostly +3.
Th, Pa and U cannot reach +7 because they do not have enough valence electrons, and Cm, Bk and Fm favour +3 (or +4 for Bk).
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