Osmium: properties of free atoms

Osmium atoms have 76 electrons and the shell structure is  2.8.18.32.14.2.

The ground state electron configuration of ground state gaseous neutral osmium is  [Xe].4f14.5d6.6s2 and the term symbol is  5D4.

Atomic spectrum

 

A representation of the atomic spectrum of osmium.

Ionisation Energies and electron affinity

The electron affinity of osmium is 106.1 kJ mol‑1. The ionisation energies of osmium are given below.

Ionisation energies of osmium
Ionisation energy number Enthalpy / kJ mol‑1
1st840
2nd1600
Kossel shell structure of osmium
The Kossel shell structure of osmium.

Effective Nuclear Charges

The following are "Clementi-Raimondi" effective nuclear charges, Zeff. Follow the hyperlinks for more details and for graphs in various formats.

Effective nuclear charges for osmium
1s74.53  
2s56.15 2p71.55  
3s53.43 3p54.25 3d62.47  
4s42.10 4p41.14 4d38.86 4f37.15
5s25.10 5p22.91 5d18.00  
6s10.32 6p(no data)  
7s   

References

These effective nuclear charges, Zeff, are adapted from the following references:

  1. E. Clementi and D.L.Raimondi, J. Chem. Phys. 1963, 38, 2686.
  2. E. Clementi, D.L.Raimondi, and W.P. Reinhardt, J. Chem. Phys. 1967, 47, 1300.

Electron binding energies

Electron binding energies for osmium. All values of electron binding energies are given in eV. The binding energies are quoted relative to the vacuum level for rare gases and H2, N2, O2, F2, and Cl2 molecules; relative to the Fermi level for metals; and relative to the top of the valence band for semiconductors.
Label Orbital eV [literature reference]
K 1s73871 [1]
L I2s12968 [1]
L II2p1/212385 [1]
L III2p3/210871 [1]
M I3s3049 [1]
M II3p1/22792 [1]
M III3p3/22457 [1]
M IV3d3/22031 [1]
M V3d5/21960 [1]
N I4s658.2 [3]
N II4p1/2549.1 [3]
N III4p3/2470.7 [3]
N IV4d3/2293.1 [3]
N V4d5/2278.5 [3]
N VI4f5/253.4 [3]
N VII4f7/250.7 [3]
O I5s84 [2]
O II5p1/258 [2]
O III5p3/244.5 [3]

Notes

I am grateful to Gwyn Williams (Jefferson Laboratory, Virginia, USA) who provided the electron binding energy data. The data are adapted from references 1-3. They are tabulated elsewhere on the WWW (reference 4) and in paper form (reference 5).

References

  1. J. A. Bearden and A. F. Burr, "Reevaluation of X-Ray Atomic Energy Levels," Rev. Mod. Phys., 1967, 39, 125.
  2. M. Cardona and L. Ley, Eds., Photoemission in Solids I: General Principles (Springer-Verlag, Berlin) with additional corrections, 1978.
  3. Gwyn Williams WWW table of values
  4. D.R. Lide, (Ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 81st edition, 2000.
  5. J. C. Fuggle and N. Mårtensson, "Core-Level Binding Energies in Metals," J. Electron Spectrosc. Relat. Phenom., 1980, 21, 275.

WebElements Shop

You can buy periodic table posters, mugs, T-shirts, fridge magnets, games, molecular models, and more at the WebElements shop

76 Os
 Osmium
 Osmium
 Osmium
 Osmium
 Osmio
 Osmio
 Osmium
 Ósmio

Search Chemistry Web

Custom Search

The Orbitron gallery of orbitals.

QR-code link to osmium web page