Arsenic: bond enthalpies in gaseous diatomic species

The bond energy in the gaseous diatomic species AsAs is 382.0 ±10.5 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 AsX bond enthalpies. All values are quoted in kJ mol-1. Each formula in the table (AsO, AsF, and so on) is a link - select these to see visual periodicity representations for bond enthalpies involving arsenic to elements of your choice.

Period 1

AsH             AsHe
274.0 ±2.9              

Period 2

AsLi AsBe AsB AsC AsN AsO AsF AsNe
        489 ±2 481 ±8 410  

Period 3

AsNa AsMg AsAl AsSi AsP AsS AsCl AsAr
    202.9 ±7.1   433.5 ±12.6 379.5 ±6.3 448  

Period 4

AsK AsCa AsGa AsGe AsAs AsSe AsBr AsKr
    209.6 ±1.2   382.0 ±10.5 96    

Period 5

AsRb AsSr AsIn AsSn AsSb AsTe AsI AsXe
    201   330.5 ±5.4   296.6 ±28.0  

Period 6

AsCs AsBa AsTl AsPb AsBi AsPo AsAt AsRn
    198.3 ±14.6          

Period 7

AsFr AsRa            


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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arsenic atomic number