Aufbau Principle(Niels Bohr)

e- are added one at a time to the lowest energy sublevels until all are filled

Pauli Exclusion Principle(Wolfgang Pauli)

Only put 2e- in each orbital and give them opposite spins

Hund's Rule(Friedrich Hund)

Put 1e- in each orbital of a sublevel before pairing e-

Proposed the very 1st atomic theory

Same # of p+, different # of n*

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Vocab

CIHS Chemistry Unit 2

Term	Definition
n=	Principle Quantum Number
l=	Shape of an orbital
ml=	Orientation on x, y, or z axis
ms=	Spin of the e-
Aufbau Principle(Niels Bohr)	e- are added one at a time to the lowest energy sublevels until all are filled
Pauli Exclusion Principle(Wolfgang Pauli)	Only put 2e- in each orbital and give them opposite spins
Hund's Rule(Friedrich Hund)	Put 1e- in each orbital of a sublevel before pairing e-
Dalton	Proposed the very 1st atomic theory
Isotope	Same # of p+, different # of n*