| A | B |
|---|
| octet rule | a concept of chemical bonding theory that is based on assumption that atoms tend to have either empty valence shells or full valence shells of eight electrons |
| ion | an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge |
| cation | an ion that has a positive charge |
| anion | an ion that has a negative charge |
| salt | an ionic compound that forms when a metal atom or a positive radical replaces the hydrogen of an acid |
| lattice energy | the energy associated with constructing a crystallattice relative to the energy of all constituent atoms separated by infinite distances |
| crystal lattice | the regular pattern in which a crystal is arranged |
| unit cell | the smallest portion of a crystal lattice that shows the three-dimensional pattern of the entire lattice |
| polyatomic ion | an ion made of two or more atoms |
