Class 11 Chemistry simulations · Structure of Atom

Electronic configuration (Aufbau, Pauli, Hund)

Fill electrons into orbitals for elements 1–36 and see unpaired electrons, including the exceptions Cr and Cu.

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What to notice

Cr (3d⁵4s¹) and Cu (3d¹⁰4s¹) break the simple order because half-filled and completely filled d subshells are extra stable.

Key relation

Order: 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p (n + l rule)

Try this

Compare Cr (24) with Mn (25) and Cu (29) with Zn (30).

What you can change

• Atomic number Z: 1 to 36

More in Structure of Atom

• Spectral series of hydrogen
• Shapes of atomic orbitals

See all Class 11 Chemistry simulations or every Physica simulation.