Bromine: bond enthalpies in gaseous diatomic species

The bond energy in the gaseous diatomic species BrBr is 192.807 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 BrX bond enthalpies. All values are quoted in kJ mol-1. Each formula in the table (BrO, BrF, and so on) is a link - select these to see visual periodicity representations for bond enthalpies involving bromine to elements of your choice.

Period 1

BrH             BrHe

Period 2

BrLi BrBe BrB BrC BrN BrO BrF BrNe
418.8 ±4 381 ±84 396 280 ±21 276 ±21 235.1 ±0.4 280 ±12  

Period 3

BrNa BrMg BrAl BrSi BrP BrS BrCl BrAr
367.4 ±0.8 <= 327.2 429 ±6 367.8 ±10.0     217.53 ±0.29  

Period 4

BrK BrCa BrGa BrGe BrAs BrSe BrBr BrKr
379.9 ±0.08 310.9 ±9.2 444 ±17 255 ±29   297 ±84 192.807  

Period 5

BrRb BrSr BrIn BrSn BrSb BrTe BrI BrXe
380.7 ±4 333.0 ±9.2 414 ±21 >= 552 314 ±59   179.1 ±0.4  

Period 6

BrCs BrBa BrTl BrPb BrBi BrPo BrAt BrRn
389.1 ±4 362.8 ±8.4 333.9 ±1.7 247 ±38 267.4 ±4.2      

Period 7

BrFr BrRa            


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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bromine atomic number