Electron Configuration (AQA A-Level Chemistry): Quizzes

Lowest energy levels first

$4s$

$1s^2$ $2s^2$ $2p^6$

$1s^2$ $2s^2$ $2p^6$

[Ar] $4s^1$

Groups 1 and 2

$4s$

Electrons occupy orbitals singly first

No two electrons in same orbital can have same spin

[Ar] $4s^1$ $3d^5$