... the atoms are covalently bonded in small groups called molecules. However, a few non-metallic substances have quite different properties compared with those of covalent molecular substances. For example, both carbon and silicon, which are group 14 elements, form oxides with formulas of CO2 and SiO2 respectively, yet the physical properties of these two compounds, are somewhat different. An exception to ... the rule – where covalent substances usually form discrete molecules. In these few cases these substances form a lattice or network of covalent bonds. Examples include silicon dioxid...

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• Approx Pages: 13
• Grade Level: Undergraduate