Electron Configuration Chart - Clark College

4
CHEM& 141 F08 7
The Aufbau Principle
As electrons get added to
elements, the get inserted into
the orbitals in order of energy.
This is not in numerical order!
The diagram at right shows
the order that electrons fill. To
create the diagram:
List the orbitals in order.
Then, draw diagonal lines
downward from right to
left.
Once you complete a
diagonal, loop back
around.
1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f
6s 6p 6d
7s
Why does this happen?
CHEM& 141 F08 8
Orbital Energies
Recall: E
n
= -
Z
2
n
2
R
h
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