CaO is the compound most likely to be ionic among the options provided.
CaO is most likely to be ionic among the compounds listed. Ionic compounds typically form between metals and non-metals, where metal atoms lose electrons to form cations, and non-metal atoms gain electrons to form anions.
In CaO, calcium (Ca) is a metal that forms a 2+ cation, and oxygen (O) is a non-metal that forms a 2- anion. This combination of a metal cation and a non-metal anion indicates an ionic bond.
The other compounds listed do not follow the typical characteristics of ionic compounds, making CaO the most likely to be ionic.
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