Orbital diagram of chromium (an exception)

An example figure from the Orbital Diagram generator.

Orbital diagram of chromium with an argon core: 4s has one up arrow and all five 3d boxes have one up arrow — The orbital diagram of chromium, an exception to the filling order: [Ar] 4s¹ 3d⁵ rather than 4s² 3d⁴. The argon noble gas core is written instead of drawn, then 4s holds one electron and each of the five 3d orbitals holds one, a half-filled d sublevel.

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Answer key

Cr: [Ar] 4s¹ 3d⁵

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