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

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Sabrina Marconie

on 19 May 2014

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

Hund's Rule
•Within a sublevel, place one electron per orbital before pairing them
•All electrons in singly occupied orbitals have the same orientation

A Video...
Aufbau Principle
• Electrons are added 1 at a time

• Electrons are added starting at the lowest energy levels
Pauli Exclusion Principle
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

To help differentiate between the other rules, remember that Aufbau is German for "building up"
• Each orbital can hold two electrons with different orientations
• This is shown in drawings with two arrows, one pointing up and one pointing down
Each arrow represents an electron
Each box represents an orbital
n=1 s
n=2 s, p
n=3 s, p, d
Energy Levels


~Sabrina Marconie
Let's say we have four electrons
Full transcript