4-Be-5  basic  element

4-beryllium-5 Atomic Mass: 5.0407900 +- 0.0042900 amu # Excess Mass: 37996.000 +- 3996.000 keV # Binding Energy: -768.000 +- 3996.000 keV # "The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.