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) |