Which of the following equals one atomic mass unit?
A) one-twelfth the mass of one carbon-12 atom
B) the mass of one electron
C) one-sixth the mass of one helium-4 atom
D) the mass of one carbon-12 atom
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one-twelfth the mass of one carbon-12 atom equals one atomic mass unit
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A)one twelfth the mass of one carbon 12 atom
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