N=1 1 Sublevel 1s Max. 2e-
N=2 2 sublevels 2s 2p max. 8e-
N=3 3 sublevels 3s 3p 3d max. 18 e-
N=4 4 sublevels 4s 4p 4d 4f max 32e-
AUFBAU- electrons enter orbitals of LOWEST energy FIRST
PAULI EXCLUSION- an orbital can only contain TWO electrons with opposite spin
HUND'S- within a sublevel electrons enter singly before pairing up
http://education.jlab.org/qa/atomicstructure_06.html
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