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Video

Pauli Exclusion Principle

• Each orbital can hold two electrons with different orientations

• This is shown in drawings with two arrows, one pointing up and one pointing down

To help differentiate between the other rules, remember that Aufbau is German for "building up"

Aufbau Principle

• Electrons are added 1 at a time

• Electrons are added starting at the lowest energy levels

Video

Energy Levels Sublevels

n=1 s

n=2 s, p

n=3 s, p, d

3 Guiding rules

Use the Aufbau principle, Hund's rule, and Pauli exclusion principle to fill electron orbitals

Aufbau Principle, Hund's Rule, and Pauli Exclusion Principle

A Video...

Let's say we have four electrons

Each arrow represents an electron

Each box represents an orbital

Hund's Rule

~Sabrina Marconie

•Within a sublevel, place one electron per orbital before pairing them

•All electrons in singly occupied orbitals have the same orientation

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