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10 cards from this deck
Arrangement of electrons in shells & sub-shells
s, p, d, f
Electrons fill lowest energy levels first
4s fills before 3d
Noble gas symbol in brackets, e.g. [Ar][Ar][Ar] 4s14s^14s1
Groups 1 & 2, outermost e⁻ in s-orbital
Groups 13-18, outermost e⁻ in p-orbital
Transition metals, filling d-orbitals
Electrons occupy orbitals singly before pairing
No 2 e⁻ in same orbital can have same spin
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