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Aufbau Principle

As protons are added to the nucleus one by one, electrons are added to hydrongen like orbitals one by one. e^- are added systematically from lowest energy to highest energy orbitals.

Huds Rule

The lowest energy configuration of an atom is where as many electrons remain unpaired as possible in the electron configuration.

Paulie Exclusion Principle

No two electrons can have the same four quantum numbers

Heisenberg Uncertainty Principle

The electron is a particle and a wave. We cannot know its speed and position at the same time

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