Electron Configuration (AQA A-Level Chemistry): Flashcards

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. $[Ar]$ $4s^1$

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