Which of the following is the best definition of the unified atomic mass unit?
A unit of mass which is equal to the mass of one-twelfth of a neutral carbon-12 atom
A unit of mass which is equal to the mass of half of a carbon-12 atom
A unit of mass which is equal to the mass of twelve grams of a neutral carbon-12 atom
A unit of mass which is equal to twice the mass of a neutral carbon-12 atom
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