Which of the following examples is a compound containing an ionic bond?A.O2B.CaOC.CH4D.H2OSUBMITarrow_backPREVIOUS

The compound that contains an ionic bond among the given options is B. CaO.

Here's why:

Ionic bonds occur between metals and non-metals. Metals lose electrons to match the electron configuration of their nearest noble gas, becoming cations (positively charged ions). Non-metals gain electrons to achieve the electron configuration of their nearest noble gas, becoming anions (negatively charged ions). The electrostatic attraction between the oppositely charged ions forms the ionic bond.

A. O2 is a molecule of oxygen, which is a non-metal. It forms a covalent bond, not an ionic bond.

B. CaO is a compound formed from calcium (a metal) and oxygen (a non-metal). Calcium loses two electrons to become Ca2+, and oxygen gains these two electrons to become O2-. The attraction between these ions forms an ionic bond.

C. CH4 is methane, a compound of carbon and hydrogen, both non-metals. They form covalent bonds, not ionic bonds.

D. H2O is water, a compound of hydrogen and oxygen, both non-metals. They form covalent bonds, not ionic bonds.