The melting points of the oxides of the third-period elements are given in parentheses: Na2O (1275°C), MgO (2800°C), A12O3 (2045°C), SiO2 (1610°C), P4O10 (580°C), SO3 (16.8°C), Cl2O7 (–91.5°C). Classify these solids in terms of crystal types.
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