Accuracy

na2r   1704 Sodium, dimer (Geo)

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    #  Species Formula
  1694 NaHCO3.(H2O)2 (Geo)CH5O5Na
  1695 NaNO3.(H2O)2H4NO5Na
  1696 NaNO3.(H2O)2 (Geo)H4NO5Na
  1697 Na(+)(H2O)6H12O6Na
  1698 Na(+)(H2O)6 (Geo)H12O6Na
  1699 Nonactin-sodium thiocyanate (NONACS) (Geo)C40H64O12Na
  1700 Sodium fluoride (NaF) (Geo)FNa
  1701 Sodium fluorideFNa
  1702 Neon sodium cation (Geo)NeNa
  1703 Sodium dimer, cationNa2
  1704 Sodium, dimer (Geo) Na2
  1705 Sodium, dimerNa2
  1706 Disodium acetylide (Geo)C2Na2
  1707 Sodium cyanide, dimerC2N2Na2
  1708 Disodium oxideONa2
  1709 Sodium oxide, Na2O (Geo)ONa2
  1710 Sodium hydroxide, dimerH2O2Na2
  1711 Disodium fluoride, cationFNa2
  1712 Sodium fluoride, dimer (Geo)F2Na2
  1713 Sodium fluoride, dimerF2Na2
  1714 Magnesium, dicationMg


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).
  
 OPEN(2,8) PM7
Sodium, dimer
 GWT=2 <Na-Na> GR=JANAF86
 Na     0.00000000 +0    0.0000000 +0    0.0000000 +0     0     0     0
 Na     3.07857000 +1    0.0000000 +0    0.0000000 +0     1     0     0