> when you combine [[Atom|Atoms]] together chemically - group of 2 or more [[Atom|Atoms]] [[Covalent Bonds|Covalently Bonded]] bonded together, the smallest unit a pure substance can be divided and still retain the composition and [[Chemistry|Chemical]] properties of that substance - examples: ![[CleanShot 2025-02-04 at 20.52.58.png|300]] - note that $O_2$ is a molecule but not a [[Compound]], since both [[Element|Elements]] are the same https://www.thescienceofeverything.net/e/episode-9-matter-and-molecules/ https://www.britannica.com/science/molecule https://www.khanacademy.org/science/hs-chemistry/x2613d8165d88df5e:chemical-bonding/x2613d8165d88df5e:covalent-bonds/a/molecules-salts-compounds-and-chemicals-what-s-the-difference