g) State four substances which are found in crystalline form.
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Crystalline substances can be described by the types of particles in them and the types of chemical bonding that takes place between the particles. There are four types of crystals: (1) ionic , (2)metallic , (3) covalent network, and (4) molecular .
Covalent network: B C (diamond) SiO 2
Molecular: H 2 I 2 NH 3 H 2 0
Type of Crystalline Solid: Examples (formulas)
Ionic: NaCl CaF 2
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