109-Mt-271
 basic

 element
109-meitnerium-271

  • Atomic Mass: 271.1412290 +- 0.0006510 amu #
  • Excess Mass: 131554.000 +- 607.000 keV #
  • Binding Energy: 1970498.000 +- 607.000 keV #
  • Beta Decay Energy: B- -4517.000 +- 634.000 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.