Atomic Structure and Electron Configuration

AP Chemistry· difficulty 2/5

The Aufbau ("building up") principle says that electrons fill

A
$The highest-energy orbital first$
B
$Only outer shells$
C
$All orbitals simultaneously$
D
$Lower-energy orbitals first, then higher$
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Explanation

Build from low to high energy: 1s \to 2s \to 2p \to 3s \to 3p \to 4s \to 3d \to 4p \to ...

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