Input interpretation
polonium selenium | atomic mass
Results
polonium | 209 u (unified atomic mass units) selenium | 78.971 u (unified atomic mass units)
polonium | atomic mass | 209 u (unified atomic mass units) (atomic mass number given for longest-lived isotope)
Relative values
| visual | ratios | | comparisons selenium | | 0.378 | 1 | 62.2% smaller polonium | | 1 | 2.65 | 165% larger