Every orbital of the same energy is singly occupied before any orbital is doubly occupied

1. Electrons enter orbitals of lowest energy first 2. Orbitals within a sublevel have equal energy

Pauli Exclusion Principle

1. An atomic orbital may only hold two electrons 2. Electrons must have opposite spins

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Chemistry Honors

3 Rules of the Bohr Atomic Model

Rule	Description
Hund’s Rule	Every orbital of the same energy is singly occupied before any orbital is doubly occupied
Aufbau Principle	1. Electrons enter orbitals of lowest energy first 2. Orbitals within a sublevel have equal energy
Pauli Exclusion Principle	1. An atomic orbital may only hold two electrons 2. Electrons must have opposite spins