Input interpretation
astatine promethium | atomic mass
Results
astatine | 210 u (unified atomic mass units) promethium | 145 u (unified atomic mass units)
astatine | atomic mass | 210 u (unified atomic mass units) (atomic mass number given for longest-lived isotope)
Relative values
| visual | ratios | | comparisons promethium | | 0.69 | 1 | 31% smaller astatine | | 1 | 1.45 | 45% larger