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The shell model (Bohr, 1913)
The nucleus sits at the centre and the electrons are spread over shells labelled by : K (), L (), M (), N (). Maximum capacities: , , , electrons, i.e. . Inner shells fill first.
High school9 min
Atomic structure: from shells to orbitals
K, L, M shells, the valence shell, orbitals and quantum numbers: distribute an atom's electrons from Z without falling into the potassium trap.
The essentials
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The valence shell
Members only
3
The atomic orbital
Members only
4
Four quantum numbers, and Pauli
Members only
5
The filling order
Members only