Electron Configuration

Breana Yacoob: Page 6

How to write electron configuration

There are many steps as far as how you write electron configuration. The number one thing you must establish is how many electrons you have. Once you figure out how many electrons you have then you have to use as many orbital sublevels as it takes to fill in your missing electrons. Remember to fill in the lowest energy first then work your way up.


1s^2 2s^2 2p^6 3s^2


Aufbau Principle-lowest energy level fills first.

Pauli Exclusion Principle-No two electrons can have the same 4 quantum numbers.

Heisenburg Uncertainty Principle- One cannot determine both the position and momentum of an electron.

Hunds Rule- Also known as the "school bus rule"