Aluminium: bond enthalpies in gaseous diatomic species

The bond energy in the gaseous diatomic species AlAl is 133 ±6 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 AlX bond enthalpies. All values are quoted in kJ mol-1. Each formula in the table (AlO, AlF, and so on) is a link - select these to see visual periodicity representations for bond enthalpies involving aluminium to elements of your choice.

Period 1

AlH             AlHe
284.9 ±6.3              

Period 2

AlLi AlBe AlB AlC AlN AlO AlF AlNe
175.7 ±14.6       297 ±96 511 ±3 663.6 ±6.3  

Period 3

AlNa AlMg AlAl AlSi AlP AlS AlCl AlAr
    133 ±6 229.3 ±30.1 216.7 ±12.6 373.6 ±7.9 511.3 ±0.8 5.34 ±0.78

Period 4

AlK AlCa AlGa AlGe AlAs AlSe AlBr AlKr
        202.9 ±7.1 337.6 ±10.0 429 ±6 5.89 ±0.81

Period 5

AlRb AlSr AlIn AlSn AlSb AlTe AlI AlXe
        216.3 ±5.9 267.8 ±10.0 369.9 ±2.1 7.43 ±0.69

Period 6

AlCs AlBa AlTl AlPb AlBi AlPo AlAt AlRn

Period 7

AlFr AlRa            


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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aluminium atomic number