Electron Configuration Electron configuration Element Element Atomic number Atomic number Electrons in orbitals Shell number sequence 1s 2s 2p 3s 3p 4s 1s 2s 2p 3s 3p 4s 1s 2s 2p 3s 3p 4s 1s 2s 2p 3s 3p 4s Electrons in orbitals Full orbital notation Electron configuration Condensed orbital notation Shell number sequence 1s 2s 2p 3s 3p 4s 1s 2s 2p 3s 3p 4s 1s 2s 2p 3s 3p 4s 1s 2s 2p 3s 3p 4s Full orbital notation Condensed orbital notation