| Description of Term | Term | Woo! |
| Atoms with the same number of protons (i.e. same atomic number) but a different number of neutrons. | |
| A rule which says that, when choosing between orbitals, electrons prefer to go in separate orbitals of the same energy. | |
| A set of electron orbitals with the same principal and second quantum numbers. | |
| ELectrons in the outermost energy shell of an atom. | |
| Measure of the ability of an atom to attract electrons to itself. | |
| A positively charged particle of mass 1.6726x10-27 | |
| The highest energy shell in an atom, containing valence electrons. All interactions between atoms take place through the electrons of the valence shell. | |
| An uncharged atomic particle of mass 1.67493x10-27 . It resides in the nucleus. | |
| A tenet of quantum mechanics that says that the position and momentum of any particle cannot both be known precisely at the same time. | |
| A set of electron orbitals with the same principal quantum number. | |
| When the attraction from the nucleus felt by one electron is lessened or blocked by intermediate electrons. | |
| States that no two electrons in an atom or molecule can have the same set of four quantum numbers. | |
| The small, dense central region of an atom around which electrons orbit. Made up of protons and neutrons. | |