Question

8.) calcium oxide (1 point)$ce{ca_{2}o_{2}}$$ce{co}$$ce{cao}$$ce{caoh}$

Explanation:

Calcium has a +2 ionic charge ($Ca^{2+}$), and oxide has a -2 ionic charge ($O^{2-}$). To form a neutral compound, one calcium ion combines with one oxide ion, resulting in the formula CaO. The other options are incorrect: $Ca_2O_2$ is an unnecessary doubled formula, CO is carbon monoxide, and CaOH is an invalid neutral compound for calcium and hydroxide/oxide.

Answer:

C. CaO