Physical Properties Comparative Features Ionic Compound Covalent Compound metal and nonmetal Types of Elements nonmetal and nonmetal transfer of electron(s) between atoms Bonding sharing of pair(s) of electron(s) between atoms gas Physical State at Room liquid Temperature solid crystalline solid soft Texture/Appearance hard brittle flexible high Melting Point Solubility in water Polarity Flammability Conductor of Heat Electrical Conductivity (s) Electrical Conductivity (aq) low high solubility low solubility high polarity low polarity mostly flammable mostly nonflammable good conductor poor conductor Do not conduct electricity Conduct electricity