* Covalent bonds form between nonmetals.
* Ionic bonds form between a metal and a nonmetal.
Let's analyze each compound:
* Carbon Dioxide (CO₂): Both carbon and oxygen are nonmetals, so they form covalent bonds.
* Sodium chloride (NaCl): Sodium is a metal, and chlorine is a nonmetal, so they form ionic bonds.
* Calcium Oxide (CaO): Calcium is a metal, and oxygen is a nonmetal, so they form ionic bonds.
* Barium Bromide (BaBr₂): Barium is a metal, and bromine is a nonmetal, so they form ionic bonds.
* Cesium Oxide (Cs₂O): Cesium is a metal, and oxygen is a nonmetal, so they form ionic bonds.
Therefore, the compound that contains one or more covalent bonds is Carbon Dioxide (CO₂).
