electron configuration prinicples

Aufbau principle

Lowest energy orbitals fill first

Coulomb’s Law

F=q₁q₂/r²

energy is inversely proportional to distance

directly proportional to the product of the charges

if there is more distance then there is less force

if there are larger forces of attraction then more energy needed

if larger forces of repulsion then less force needed

Pauli exclusion principle

No two electrons in an atom can have the same four quantum numbers. Basically, no more than two electrons in a single orbital and those two electrons must have opposite spins.

electrons that are paired must have opposite spin

Hund’s rule / “bus rule”

When filling orbitals in the same sublevel, maximize the number of parallel spins

electrons fill a sublevel unpaired and then pair up