95-Am-231  basic  element

95-americium-231 Atomic Mass: 231.0455600 +- 0.0003200 amu # Excess Mass: 42439.000 +- 298.000 keV # Binding Energy: 1747713.000 +- 298.000 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.