Solve the Secular Equation HΨ = ESΨ
   Atom numbers and labels are optional      Valence Orbital Ionization Energies Table

S =
Atom:
Label:
using atom and orbital types

H =

Results:

Valence Orbital Ionization Energies, eV

Atom 1s 2s 2p 3s 3p 4s 4p
H 13.6
He 24.5
Li 5.45 3.5
Be 9.30 6.0
B 14.0 8.30
C 19.5 10.7
N 25.5 13.1
O 32.3 15.9
F 40.4 18.7
Ne 48.5 21.5
Na 5.21
Mg 7.68
Al 11.3 5.95
Si 15.0 7.81
P 18.7 10.2
S 20.7 11.7
Cl 25.3 13.8
Ar 29.2 15.9
K 4.34
Ca 6.07
Zn 9.42
Ga 12.6 5.95
Ge 15.6 7.56
As 17.6 9.05
Se 20.8 10.8
Br 24.0 12.5
Kr 27.5 14.3
3d 4s 4p
Sc 4.71 5.70 3.22
Ti 5.58 6.07 3.35
V 6.32 6.32 3.47
Cr 7.19 6.57 3.47
Mn 7.93 6.82 3.59
Fe 8.68 7.07 3.72
Co 9.42 7.32 3.84
Ni 10.0 7.56 3.84
Cu 10.7 7.69 3.97
One-electron ionization energies of the valence orbitals calculated by finding the average energies of both the ground-state and ionized-state configurations. (Harry Gray, Electrons and Chemical Bonding, Benjamin/Cummings, 1964, Appendix)

Colby College Chemistry, T. W. Shattuck, 8/13/2013