s - spherical shaped
p - dumb-bell shape with x,y, and z axis
d,f - complex shapes
khanacademy
Rules for Placing Electrons:
Aufbau Principle: electrons enter orbitals of lowest energy first
Pauli Exclusion Principle: an orbital can only contain two electrons with opposite spin
Hund's Rule: within a sublevel, electrons enter singly before pairing up
chemwiki
kentchemistry
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