Question

complete the sentence using oxalate, oxic or oxide. a binary ionic compound with the formula feo would be named iron(ii)

Explanation:

To name binary ionic compounds, we identify the cation and anion. In FeO, the cation is iron(II) ($\text{Fe}^{2+}$) and the anion is oxide ($\text{O}^{2-}$). Oxalate is $\text{C}_2\text{O}_4^{2-}$ (not present here), and "oxic" is not a standard anion name for this. So the anion here is oxide.

Answer:

oxide