Crystal Types
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Crystal Type | Particles | Attractive Forces | Properties | Examples
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Ionic | Positive and Negative ions | Electrostaitic attractions | High m.p., hard, brittle, good electrical conductor when melted | NaCl, BaO, KNO3
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Polar, Molecular | Polar Molecules | Dipole-dipole (possible hydrogen bonds) | Low m.p., Soft, Nonconductor of electricity, larger separation between m.p. and b.p. | H2O, BrCl, SO2
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Nonpolar, Molecular | Nonpolar Molecules | London dispersion forces | Very low m.p., Very Soft, Nonconductor of electricity, Smaller separation between m.p. and b.p. | H2, Cl2, CH4
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Covalent (Network) | Atoms | Covalent bonds | Very high m.p., Very Hard, Nonconductor of electricity | Diamond, SiO2, SiC, AlN
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Metallic | Atoms with mobile electrons | Metallic bonds | Generally fairly high m.p., Hard or soft, Malleable and ductile, Good conductor of electricity | Ag, Cu, Na, Fe
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