Input interpretation
protactinium actinium | atomic mass
Results
protactinium | 231.03588 u (unified atomic mass units) actinium | 227 u (unified atomic mass units) (atomic mass number given for longest-lived isotope)
Relative values
| visual | ratios | | comparisons actinium | | 0.983 | 1 | 2% smaller protactinium | | 1 | 1.02 | 2% larger