Electron Configuration

What the Periodic Table would look like with the Lanthanides and Actinides inserted

Bohr Model

The Electron Cloud

AufBau Rule

AufBau Rule with Orbitals

Argon Argon 18 Electrons 8 in Valence shell, therefore an inert (Nobel) element.

Potassium Notice that we start a fourth shell before we fill up the third shell! We would expect that shell 1 would hold 2, shell 2 would hold 8 and shell 3 would hold 18 but we start a fourth shell before we fill up the third shell.

Scandium Notice that we start a fourth shell before we fill up the third shell! We would expect that shell 1 would hold 2, shell 2 would hold 8 and shell 3 would hold 18 but we start a fourth shell before we fill up the third shell.

Periodic Table with Energy levels and Orbitals

Periodic Table with Elements, Energy Levels and Orbitals