Chemistry / Unit 5 Chem 0868 short lesson, about 20 seconds
Exceptions to the Aufbau Filling Order
Captions available
The idea
A few elements fill orbitals departing from the Aufbau sequence, favoring a half-filled or fully filled d subshell over the predicted order.
In practice
Some transition metals place one fewer electron in the s subshell than plain Aufbau order predicts, shifting it into d instead.
Where people slip
These filling-order exceptions are a recognized feature of certain transition metals, not evidence Aufbau is unreliable elsewhere.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Unlocks
- Nothing yet depends on this.
Something wrong in this lesson? Flag it · Sources for Chemistry