Question

define atomic mass unit​

Answer 1

Hey mate here is it answer!!
Atomic mass unit means a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.

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Answer 2

atomic mass is the mass of the atom, which is the sum of no. of protons and neutrons.Atomic mass unit ( AMU) are described as a unit of measurement for atoms and molecules .1 atomic mass is defined as 1/12 the mass of carbon -12.