Electron Orbital Viewer Electron Orbitals Viewer (Z = 1 to 18) Select Atomic Number (Z): 1 – H 2 – He 3 – Li 4 – Be 5 – B 6 – C 7 – N 8 – O 9 – F 10 – Ne 11 – Na 12 – Mg 13 – Al 14 – Si 15 – P 16 – S 17 – Cl 18 – Ar