Moleculedefinition: the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound.. See examples ofMOLECULEused in a sentence. Jul 5, 2024 ·Amoleculeis a group of two or more atoms bonded together, forming the smallest unit of achemicalcompound that retains itschemicalproperties. Atoms in amoleculeare held together bychemicalbonds, such as covalent bonds, where they share electrons. For example, a watermolecule(H₂O) consists of two hydrogen atoms and one oxygen atom bonded together. Molecules can vary in size and ... Amoleculeis a particle made up of two or more atoms that are chemically bonded together; the number of atomic nuclei making up amoleculeis a determinate number. Sep 12, 2020 ·A molecule isan electrically neutral group of atoms held together by chemical bonds.Learn the difference between a molecule and a compound, an ion, and an alloy, and see examples of molecules of different types.