Input interpretation
actinium francium | atomic mass
Results
actinium | 227 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 | | 0.98 | 1 | 2% smaller actinium | | 1 | 1.02 | 2% larger