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Molecular Compounds have low melting and boiling point as compare to the Ionic Compounds. Molecular Compounds can be in any state, solid, liquid or gas at room temperature, whereas Ionic Compounds are always in solid state with forming crystalline appearance.
Nomenclature of Ionic Compounds. Ionic compounds are composed of ions. An ion is an atom or molecule with an electrical charge. Monatomic ions are formed from single atoms that have gained or lost electrons. Polyatomic ions are. formed from molecules (groups of atoms bonded together) that have gained or lost electrons.