Is formed when two or more atoms are joined together chemically. these atoms can be the same or different?

A molecule is formed when two or more atoms are joined together chemically, which can include atoms of the same element, like oxygen (O₂), or different elements, such as water (H₂O). The chemical bonds connecting the atoms can be covalent or ionic, depending on how the atoms share or transfer electrons. Molecules can vary in size and complexity, ranging from simple diatomic molecules to large macromolecules.