It is measured in Atomic Mass Unit i.e. molecular mass unit (u - micron)
1u = 1.66x10^-27 kg
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Atomic mass units
Cobalt is an atomic mass of 58.93 atomic mass units
The atomic mass of astatine is 209.9871 atomic mass units (amu). The atomic mass is given for the longest lived isotope of astatine, which is astatine-210, with a half life of 8.3 hours.
Atomic mass is so small you can't actually measure it. So, just like carbon dating, you have to use a relative mass.
Atomic mass is the measure of a mass of one atom in relation to 1/12 mass of Carbon 12 atom and measured in atomic mass unit(amu) or Dalton unit or grams/mol.Relative atomic mass is also the relative mass but does not have a unit but a ratio number.