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Classifiy the following into inoic, molecular, covalent and metallic crystals:
`SiO_(2)` (quartz), brass bronze, dry ice, nitre diamond, `H_(2) O` (ice), `SO_(2), I_(2) CaO`

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Ionic = Nitric, `CaO`
Molecular `= SO_(2)` (polar), `I_(2)` (non-polar), `H_(2)O` (H-bonded)
Covalent = Dry ice `(CO_(2))`, `SiO_(2)`, Diamond
Metallic = Brass, bronze

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