1. Network Covalent, Ionic, and Metallic Solids Most gases & liquids (@ RT) = molecules Nonmolecular solids: 1.network covalent solids (continuous network covalent = 1 large crystal) 2.ionic solids (strong electrical forces, ions; opposite charges adjacent to each other) 3.metallic solids (units are electrons & cations (+1, +2, +3)

2. 1.Network Covalent Solids high mp (~1,000 o C) do not conduct electricity (

3. Diamonds (sp 3 : each C w/4 in tetrahedral) Graphite (sp 2 : each C w/3 hexagonal in planar)

4. 2. Ionic Solids

5. nonvolatile; high mp (600 o C – 2000 o C) do not conduct electricity (ions fixed in position) conduct electricity when melted or dissolved in water (Na + & Cl – free to move) many are soluble in water (ionic compounds are insoluble in nonpolar solvents (CCl 4 ; C 6 H 14 (hexane))

7. 3. Metallic Solids high electrical conductivity (sea of electrons = mobile electrons) high thermal conductivity (carried through e – collisions) ductile & malleable (e – flexible glue) luster (reflect all wavelengths; e – not specific bond can absorb/emit; e.g,. Au absorbs some light in blue = yellow)