**Electron notation** is a notation for characterizing quantity and arrangements of electrons within atoms. The notation shows in order numbers of electrons, shells, and orbitals separated by hyphens. For example, 46-5-9 shows that there are 46 electrons, 5 shells, and 9 orbitals. This notation belongs to palladium.

Electron notation is related to electron configuration, a notation for characterizing electrons per orbital.