Selenium: bond enthalpies in gaseous diatomic species

The bond energy in the gaseous diatomic species SeSe is 332.6 ±0.4 kJ mol-1.

The following values refer to neutral heterodiatomic molecules in the gas phase. These numbers may well differ considerably from, say, single bond energies in a solid. All values are given in kJ mol-1.

Table of diatomic SeX bond enthalpies. All values are quoted in kJ mol-1. Each formula in the table (SeO, SeF, and so on) is a link - select these to see visual periodicity representations for bond enthalpies involving selenium to elements of your choice.

Period 1

SeH             SeHe
314.47 ±0.96              

Period 2

SeLi SeBe SeB SeC SeN SeO SeF SeNe
    461.9 ±14.6 590.4 ±5.9 370 ±11 464.8 ±21.3 339 ±42  

Period 3

SeNa SeMg SeAl SeSi SeP SeS SeCl SeAr
    337.6 ±10.0 548 363.6 ±10.0 371.1 ±6.7 322  

Period 4

SeK SeCa SeGa SeGe SeAs SeSe SeBr SeKr
      489 ±4 96 332.6 ±0.4 297 ±84  

Period 5

SeRb SeSr SeIn SeSn SeSb SeTe SeI SeXe
  about 285 247 ±17 401.2 ±5.9   291.6 ±4    

Period 6

SeCs SeBa SeTl SePb SeBi SePo SeAt SeRn
      302.9 ±4 280.3 ±5.9      

Period 7

SeFr SeRa            


I am grateful to Professor J.A. Kerr (University of Birmingham, UK) for the provision of the bond strengths of diatomic molecules data.

The values given here are at 298 K. All values are quoted in kJ mol-1. Generally, these data were obtained by spectroscopic or mass spectrometric means. You should consult reference 1 for further details. A note of caution: the strength of, say, the C-H bond in the gaseous diatomic species CH (not an isolable species) is not necessarily, the same as the strength of a C-H bond in, say, methane.

The strongest bond for a diatomic species is that of carbon monoxide, CO (1076.5 ± 0.4 kJ mol-1). The strongest bond for a homonuclear diatomic species is that of dinitrogen, N2 (945.33 ± 0.59 kJ mol-1).


  1. J.A. Kerr in CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, D.R. Lide, (ed.), CRC Press, Boca Raton, Florida, USA, 81st edition, 2000.

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selenium atomic number