| A | B |
|---|
| chemical formula | tells which elements are in a compound and their 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 | a charged atom |
| ionic bond | a chemical bond formed by attractions between opposite charges |
| covalent bond | chemical bond formed by atoms when they share electrons |
| polar molecule | a molecule that has opposite charges on each end |
| nonpolar molecule | a molecule that does not have charged ends |
| toxic | hazardous substance that is poisonous |
| corrosive | hazardous compound that attacks and changes materials |
| oxidation number | a positive or negative number that indicates how many electrons an atom has lost, gained or shared when bonding |
| binary compound | chemical compound composed of two elements |
| polyatomic ion | a group of covalently bonded atoms in which the whole group has a charge |
| hydrate | compound that has water molecules chemically attached to its ions |
