1. The problem statement, all variables and given/known data I'm having trouble figuring out if a solid is a molecular solid or network covalent solid. Classify the following as a network covalent solid or a molecular solid: 1. CO2 2. SiO2 2. Relevant equations Molecular solid held together by intermolecular forces Covalent network solids are held together by covalent bonds. 3. The attempt at a solution I know that CO2 is a molecular solid and SiO2 is a network covalent solid, but I'm not sure how I would figure that out. They both have two oxygen atoms, and carbon and silicon have the same number of valence electrons. What makes them different types of solids then?