Chemistry · Structure of Atom
The correct order of filling orbitals according to the Aufbau principle is:
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- 11s → 2s → 2p → 3s → 3p → 3d → 4p
- 21s → 2s → 2p → 3s → 3p → 3d → 4s
- 31s → 2s → 2p → 3s → 3p → 4s → 3d✓
- 41s → 2s → 2p → 3s → 3p → 4s → 4d
Correct answer
1s → 2s → 2p → 3s → 3p → 4s → 3d
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