| A | B |
|---|
| chemical formula | tells which elements are in a compound and the ratios |
| chemically stable | an atom whose outer energy level is completely filled with electrons |
| chemical bond | force that holds together the atoms in a compound |
| ion | positively- or negatively-charged atom |
| ionic bond | chemical bond formed by the attraction between opposite charges of the ions in an ionic compound |
| covalent bond | chemical bond formed by atoms when they share electrons |
| polar molecule | molecule with opposite charges on each end |
| nonpolar molecule | molecule that does not have oppositely charged ends |
| toxic | hazardous substance that can injure living tissue; poisonous |
| corrosive | hazardous compound that attacks and alters metals, human tissue, and other materials: oven cleaners and battery acid are examples |
| oxidation number | pos. or neg. number telling how many electrons atoms lose, gain, or share when bonding |
| binary compound | compound composed of two elements |
| polyatomic ion | group of covalently bonded atoms in which the whole group is positively or negatively charged |
| hydrate | compound that has water molecules attached to its ions and written into its formula |
| flammable | compounds that burn easily; gasoline and paint thinners are examples |
