By definition, the SI unit for the mass of subatomic particles is amu.
In chemistry the mass of an atom is called atomic mass, which is made up of the total mass of protons and neutrons. Electrons have much less mass that they are supposed to have negligible effect.
The unit of measurement for atomic mass is known as “amu”, which is the abbreviation for “atomic mass units”. It is defined from the twelfth (1/12) of the mass of a Carbon atom. Thus, 1 amu corresponds to 1.66053904x10²⁴ grams.
That is, an atomic mass unit or AMU is a physical constant that represents a mass unit used to express atomic masses and molecular masses.
In summary, the SI unit for the mass of subatomic particles is amu.
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