Question

what is the name of the ion represented by the following symbol? o^{2 -}
a oxygen ion
b dioxide
c oxide
d none of the above

Explanation:

The symbol $O^{2 -}$ represents an oxide ion. Oxygen in this form has gained 2 electrons, giving it a - 2 charge. An oxygen ion is a more general term and not the specific name for $O^{2 -}$. Dioxide refers to a compound with two oxygen atoms like $CO_2$.

Answer:

C. oxide