Input interpretation
radium francium | atomic mass
Results
radium | 226 u (unified atomic mass units) francium | 223 u (unified atomic mass units) (atomic mass number given for longest-lived isotope)
Relative values
| visual | ratios | | comparisons francium | | 0.99 | 1 | 1% smaller radium | | 1 | 1.01 | 1% larger