Which of the following equals one atomic mass unit

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

Answer:

A) one-twelfth the mass of one carbon-12 atom

 

Which of the following equals one atomic mass unit

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