PPT Slide
- Methane crystallizes in a face-centered cubic arrangement with the carbon of each CH 4 centered on the packing site.
- Various combinations of intermolecular forces hold the molecules in the crystal; molecular solids have a wide range of physical properties.
- The intermolecular forces are relatively weak, so the melting points are lower than those of ionic, network covalent, and metallic solids.
- In ionic solids the unit cell contains cations and anions. Interparticle forces are stronger than the forces in atomic or molecular solids.
- Ionic compounds adopt a few different crystal structures; a common arrangement with a 1:1 ratio of ions is the sodium chloride structure.
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