Input interpretation
potassium francium | atomic mass
Results
potassium | 39.0983 u (unified atomic mass units) francium | 223 u (unified atomic mass units)
francium | atomic mass | 223 u (unified atomic mass units) (atomic mass number given for longest-lived isotope)
Relative values
| visual | ratios | | comparisons potassium | | 0.175 | 1 | 82.5% smaller francium | | 1 | 5.7 | 470% larger