Atomic orbital-region of space where an electron is likely to be found
Sublevel-set of orbitals having equivalent energy Electron Configuration- the arrangement of electrons in energy levels
Ground State- the state that has the least energy level in an atom
Excited State Electron Configuration- an electron configuration that has the right number of electrons but has a higher energy level
Pauli exclusion principle- if two electrons occupy the same orbital, then they must have opposite spins
Hund's rule- electrons will pair up in an orbital only when all orbitals in the same sublevel have one electron and when single electrons occupy different orbitals, then they all have the same spin