The term 'Parts of Molecules' refers to the components that make up a molecule. The most basic part of a molecule is an atom, which is composed of protons, neutrons, and electrons. ATOMS are held together by chemical bonds, which can be either covalent or ionic. Covalent bonds involve the sharing of electrons between ATOMS, while ionic bonds involve the transfer of electrons from one atom to another. These bonds form the basis of all molecules, and the arrangement of ATOMS within a molecule determines its properties.