Input interpretation
radioactive elements | atomic mass
Summary
median | 257 u highest | 294 u (oganesson) lowest | 98 u (technetium) distribution |
Units
Distribution plots
(atomic mass in unified atomic mass units)
Atomic mass rankings
1 | technetium | 98 u 2 | promethium | 145 u 3 | polonium | 209 u 4 | astatine | 210 u 5 | radon | 222 u 6 | francium | 223 u 7 | radium | 226 u 8 | actinium | 227 u 9 | protactinium | 231.03588 u 10 | thorium | 232.0377 u ⋮ | | 28 | meitnerium | 278 u 29 | roentgenium | 281 u 30 | darmstadtium | 281 u 31 | copernicium | 285 u 32 | nihonium | 286 u 33 | flerovium | 289 u 34 | moscovium | 289 u 35 | tennessine | 293 u 36 | livermorium | 293 u 37 | oganesson | 294 u
Unit conversions for median atomic mass 257 u
257 Da (daltons)
0.257 kDa (kilodaltons)
4.27×10^-22 grams
4.27×10^-25 kg (kilograms)
257 chemical atomic mass units (unit officially deprecated)
257 physical atomic mass units (unit officially deprecated)
Comparison for median atomic mass 257 u
≈ 1.2 × lead-208 atomic mass ( ≈ 208 u )
Corresponding quantities
Relative atomic mass A_r from A_r = m_aN_A/M_u: | 257
Molar mass M from M = m_aN_A: | 257 g/mol (grams per mole)