Electron Configuration Chart - Clark College
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CHEM& 141 F08 9
Summary of Electron-filling Rules
• The Pauli Exclusion Principle
– Electrons are like spinning magnets, and must have
opposite alignment.
– We “imagine” this as one “↑” and one “↓”.
• The Aufbau Principle
– The orbitals get filled from the lowest energy to the highest
energy, based on incomplete shielding.
• Hund’s Rule
– When multiple orbitals are present, each orbital gets filled
singly at first, and pairing begins.
– The single electrons all have the same alignment.
CHEM& 141 F08 10
Writing Electronic Configurations
To determine the electron configuration:
1) Find the number of electrons for the element.
2) Fill the electrons in order of the Aufbau Principle.
3) Use Hund’s Rule and the Pauli Exclusion
Principle for orbital diagrams.
Example: Nitrogen - Element #7 → 7 electrons
1s 2s 2p 2p 2p
1s
2
2s
2
2p
2
Orbital Diagram
Electronic Configuration
• Each individual orbital gets a “box”.
• Electrons are filled into the boxes
until the total is reached.
The energy,
or “n” level
The number of
electrons within
each set of orbitals
The orbital
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