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Atomic structureNucleus
NeutronProton
Electron
Ø It is impossible to know where exactly electrons in an atom are located at any given moment in time and how exactly they move
Werner Heisenberg
Ø Orbital – region of space inside atom where an electron is likely to be found; map that shows the probability of the electron being at each point inside the atom
Wolfgang PauliØ No more than two electrons can reside in any orbital
Subshells and shells
1s
2s
3s
4s
5s
6s
7s
2p
3p
4p
5p
6p
7p
3d
4d
5d
6d
7d
4f
5f
6f
7f
Incr
easi
ng s
ize
Incr
easi
ng e
nerg
y
Increasing energy
Principal quantum number (indicates shell)
Letter indicates subshell
1st shell
2nd shell
3rd shell
4th shell
5th shell
6th shell
7th shell
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 5d 6p 7s 4f …
Increasing energy
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