103-Lr-251  basic  element

103-lawrencium-251 Atomic Mass: 251.0943600 +- 0.0003200 amu # Excess Mass: 87896.000 +- 298.000 keV # Binding Energy: 1857424.000 +- 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.