Electron configurations of all 118 elements. Orbital filling order: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p. Examples: oxygen 1s² 2s² 2p⁴, sodium 1s² 2s² 2p⁶ 3s¹. Exceptions: chromium and copper.
See also : /en/molar-mass-calculator | /en/printable-periodic-table | /en