Question

Define atomic mass unit
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Answer 1

Answer:

An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of Carbon-12. The Carbon-12 atom has six protons and six neutrons in its nucleus. In imprecise terms, one AMU is the average of the proton rest mass and the neutron rest mass.

Answer 2

Answer:

Atomic mass unit (Amu) is used to express atomic and molecular weights or the mass of atomic and subatomic particles and equal to 1/2 the mass of the carbon-12 atom. It is also called Dalton.