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Energy levels
1 2 3 4
Subshells in energy levels
1 - S
2 - S,P
3 - S,P,D
4 - S,P,D,F
Orbitals
S - 1
P - 3
D - 5
F - 7
1 orbital holds 2 electrons
Order subshells are filled up
1S
2S
2P
3S
3P
4S
3D
4P
4D
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