Input interpretation
![astatine promethium | atomic mass](../image_source/6987f2ddc49f847b2ae91c19113a7361.png)
astatine promethium | atomic mass
Results
![astatine | 210 u (unified atomic mass units) promethium | 145 u (unified atomic mass units)](../image_source/9ce23c7ad94ec483cc1c17286495bb64.png)
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)](../image_source/738bc364319ddafa57e736bd414ad890.png)
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](../image_source/805b6c4dbaf14001f2b0bdbc3c5a1ed5.png)
| visual | ratios | | comparisons promethium | | 0.69 | 1 | 31% smaller astatine | | 1 | 1.45 | 45% larger