Which can exist independently - atoms or molecules?

Atoms are the smallest entity of a matter. Atoms of only some elements like noble gases are unreactive and can exist independently. For example, Neon (Ne), Argon (Ar)

Molecules are a group of two or more atoms that are bonded by chemical bonds. Molecules have the capability to exist independently. Gases like hydrogen (${\mathrm{H}}_2$) and oxygen (${\mathrm{O}}_2$) are molecules and they exist independently.