Accuracy

beryllium, dimer     22 Beryllium, dimer

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    #  Species Formula
    12 Lithium, dimer (Geo)Li2
    13 Lithium dimerLi2
    14 Beryllium, atomBe
    15 Beryllium hydride, cation (Geo)HBe
    16 Beryllium hydride, cationHBe
    17 Beryllium hydride (Geo)HBe
    18 Beryllium hydrideHBe
    19 Beryllium dihydrideH2Be
    20 LiBeH (Geo)HLiBe
    21 Lithium beryllium hydrideHLiBe
    22 Beryllium, dimer Be2
    23 Boron, cationB
    24 Boron, atomB
    25 BH (Geo)HB
    26 Borane(1)HB
    27 BH2 (Geo)H2B
    28 Borane(2)H2B
    29 BoraneH3B
    30 Boron dimer (Geo)B2
    31 Boron dimerB2
    32 B2H4 (C2v) (Geo)H4B2


ΔHf: 152.3 kcal/mol,     REF: M. W. Chase, C. A. Davies, J. R. Downey, D. R. Frurip, R. A. McDonald, A. N. Syverud, JANAF Thermochemical Tables, Third Edition, J. Phys. Chem. Ref. Data 14, Suppl. 1 (1985).
  
 PM7
Beryllium, dimer
 H=152.3 HR=JANAF86
 Be     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
 Be     1.57858362 +1    0.0000000 +0    0.0000000 +0     1     0     0