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Metal insulator semiconductor Held

COVALENT-NETWORK SOLIDS (SECTION 12.7) Covalent-network solids consist of atoms held together in large networks by covalent bonds. These solids are much harder and have higher melting points than molecular solids. Important examples include diamond, where the carbons are tetrahedrally coordinated to each other, and graphite, where the sp -hybridized carbon atoms form hexagonal layers. Semiconductors are solids that do conduct electricity, but to a far lesser extent than metals. Insulators do not conduct electricity at all. [Pg.519]

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