| Description of Term | Term | Woo! |
| Associated with one particular atom, in which electrons reside | |
| The energy change in an atom when it gains an electron. | |
| German for 'building up', a systematic procedure for determining the electron configuration of any atom | |
| When the attraction from the nucleus felt by one electron is lessened or blocked by intermediate electrons. | |
| A rule which says that, when choosing between orbitals, electrons prefer to go in separate orbitals of the same energy. | |
| The small, dense central region of an atom around which electrons orbit. Made up of protons and neutrons. | |
| An ion with a net negative charge. | |
| An uncharged atomic particle of mass 1.67493x10-27 . It resides in the nucleus. | |
| The energy it takes to remove an electron from an atom. | |
| Description for two elemental species with the same electronic configuration | |
| Through shielding, the breaking of degenerate orbitals within a shell in multi-electron atoms. | |
| A tenet of quantum mechanics that says that the position and momentum of any particle cannot both be known precisely at the same time. | |
| States that no two electrons in an atom or molecule can have the same set of four quantum numbers. | |