99-Es-240  basic  element

99-einsteinium-240 Atomic Mass: 240.0689200 +- 0.0004300 amu # Excess Mass: 64199.000 +- 401.000 keV # Binding Energy: 1795466.000 +- 401.000 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.