|
TYPES OF SOLIDS |
| AMORPHOUS SOLIDS with no orderly arrangement | ||||
| Type | Bonds | Structural units | Melting points | Examples |
| AMORPHOUS | Weak, interatomic or
intermolecular | Atoms or molecules | Moderate | SiO2 (glass) |
| CRYSTALLINE SOLIDS with orderly arrangements | ||||
| MOLECULAR | Weak, intermolecular | Molecules | Low | H2O (ice), CO2 (dry ice) |
| IONIC | Electrical attractions | + and - ions | High | NaCl (salt), CaCO3 |
| ATOMIC: COVALENT | Covalent bonds | Atoms | Very high | C (diamond) |
| ATOMIC: METALLIC | Interatomic | Atoms, plus loose electrons | Wide variation: Hg -39oC, W 3410oC; most betw. 100-2000 | Fe (iron), Cu (copper) |