Ionic substances: Sodium chloride, Giant lattice structure, Strong bonds between ions, Very high melting and boiling points, Conduct electricity when melted or dissolved in water, Consist of a metal and a non metal, Strong bonds need to break for these to melt, Solid at room temperature, MgCl2, , Do not form molecules, Simple covalent molecules: Chlorine molecules, Br2, , Strong bonds between atoms, Consist of non metals only, Liquid or gas at room temperature , Weak intermolecular forces between molecules, Weak forces need to be overcome for these to melt and boil, Intermolecular forces are stronger between larger molecules, , Do not conduct electricity,

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