Input interpretation
roentgenium mendelevium | atomic mass
Results
roentgenium | 281 u (unified atomic mass units) mendelevium | 258 u (unified atomic mass units) (atomic mass number given for longest-lived known isotope)
Relative values
| visual | ratios | | comparisons mendelevium | | 0.92 | 1 | 8% smaller roentgenium | | 1 | 1.09 | 9% larger