Question

which description best describes a diatomic/elemental molecule? made up of 2 or more of the same kind of atom that are chemically bonded made up of 2 or more different types of substances that are not chemically bonded made up of only 1 kind of atom made up of 2 or more different types of atoms that are chemically bonded

Explanation:

A diatomic/elemental molecule is composed of two or more of the same kind of atom that are chemically bonded. For example, oxygen gas ($O_2$) is a diatomic molecule made up of two oxygen atoms chemically bonded together. It is elemental because it consists of only one - type of atom.

Answer:

made up of 2 or more of the same kind of atom that are chemically bonded