| According to IUPAC rules, lawrencium is officially classified to be an actinoid, but its probable valence electron arrangement indicates it is a transition metal. |
| The fourth valence electron in carbon has its orbital perpendicular to the plane. |
| Silver and copper ions have one valence electron outside their closed shells. |
| This is especially important in alkali metals where the one valence electron is particularly sensitive to any core changes. |
| Due to the presence of a ring, cycloalkanes have two less H atoms than open-chain alkanes in order to satisfy the valence electron rule. |
| All elements in a specific group have equivalent outermost, or valence electron, configurations which accounts for the similarity in the number and type of chemical bonds these elements form. |
