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Text Elements
1s
2s
2p
3s
3p
4s
3d
1s
2s
2p
3s
3p
3
0
1s
2s
2p
3s
3p
3
1s
2s
2p
3s
3p
4s
3d
4p
0
1s
2s
2p
2
Hund’s rule - it needs to spread before doubling up
Aufbau rule - did not fill in 4s before 3d
Aufbau rule - you have to fill lowest energy level to highest
Pauli exclusion principle: in 3s the arrows both point up which is no good.
85
33
20
[Ar] 4s2
[Ar] 4s2 3d10 3p3
[Xe] 7s2 6d10 7p5
absorbed
absorbed
emitted
absorbed
absorbed
emitted
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