The oxidation number of which of the following elements is often +2 but can be as great as +7?
A)manganese
B)cobalt
C)aluminum
D)bismuth
E)chromium

Question

Quizplus · Accepted Answer

Manganese often has an oxidation state of +2 in compounds like MnO, MnCl2, but it can exhibit a wide range of oxidation states from +2 up to +7, as seen in permanganate (MnO4^-), where it has an oxidation state of +7.

The Oxidation Number of Which of the Following Elements Is