Atomic Orbital

Quantum Numbers

  • $n$: principal quantum number
  • $l$: orbital quantum number (angular momentum quantum number, or azimuthal qunatum number)
  • $m$: magnetic quantum number
  • $s$: spin quantum number

Electron Filling Order

The following is the order for filling the "subshell" orbitals, which also gives the order of the "blocks" in the periodic table:

$$ \large 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p $$

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