Final answer:
In diatomic molecules, a covalent bond occurs through the sharing of electron pairs between atoms.
Step-by-step explanation:
In diatomic molecules, the type of chemical bond that occurs is a covalent bond. A covalent bond is formed through the sharing of electron pairs between atoms. This occurs when two atoms, typically nonmetals, come together and share their valence electrons. For example, in the diatomic molecule of oxygen (O2), the two oxygen atoms each share two electrons to form a double covalent bond.
Learn more about Type of chemical bond in diatomic molecules