| negative ion | 1.12 | If negative ions predominate, nothing happens. | ||
| charged ion | 0.99 | The excited electron whizzes off, leaving a positively charged ion. | ||
| metal ion | 0.92 | The metal ions in a metallic lattice may be regarded as spheres. | ||
| positive ion | 0.79 | Plasma consists of positive ions and unbound electrons. | ||
| complex ion | 0.33 | The formula of the complex ion is enclosed in square brackets. | ||
| gaseous ion | 0.26 | This is the formation of the lattice from its gaseous ions. |