One-twelfth the mass of a carbon-12 atom or 1,660538921(73)×10−27 kg.
the mass of an electron
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The unified Atomic Mass unit is equal t0 1/12 from the mass of the neutral atom carbon-12 or 1,660538921(73)×10−27 kg.
The atomic mass unit is not a SI unit. An atomic mass unit is equal to 1/12 from the atomic mass of the isotope 12C.
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.
1.0078 amu
Iron is a meta element. Atomic mass of it is 56.
It is measured in Atomic Mass Unit i.e. molecular mass unit (u - micron) 1u = 1.66x10^-27 kg