| A | B |
|---|
| formula mass | the sum of the atomic masses of the atoms in a formula |
| empirical formula | the formula giving the simplest ratio between the atoms of the elements present in a compund |
| molecular formula | a formula indicating the actual number of atoms of each element making up a molecule |
| binary compound | a compound composed of only two elements |
| molecule | a neutral group of atoms held together by covalent bonds |
| ionic compound | a compound that is formed by transfer of electrons from one component to another |
| polyatomic ion | a group of atoms covalently bonded but possessing an overall charge |
| oxidation numbers | the apparent charge on an atom if the electrons in a compound are assigned according to established rules |
| chemical formula | the notation using symbols and numerals to represent the composition of substances |
| ion | an atom or molecule that has gained or lost one or more electrons |
| chemical symbol | a notation using one to three letters to represent an element |
