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Covalent or, network solids, , , , , 4. | Metallic solids, , , , , , Positive and Strong electro, , , , , ee y Brittle, hi ;, Negative ions | static forces of poor ee, attraction and electricity in sol;, (ionic bond) ae, , Atoms, , , , , , Positive ions Electrical, and mobile attraction or, electrons Metallic bond, , , , , , covalent bond | hard, high melting, poor, , , , , , , , State, , , , conductors of heat and, electricity (But graphite, is an exception), , , , Good conductors of, ~ heat and electricity,, possess metallic lustre,, Melting point varies, from low to high, values. Some are soft, while many are hard, , , , , , , , , , , , , , , , , , , , LiF, Baso,,, etc,, Diamond,, silicon, quartz, (Si0,), SiC,, AIN, graphite, All metals and, some alloys