Problem: One twelfth the mass of a carbon-12 atom is used to define a(an)a. atomic mass.b. mass number.c. atomic number.d. atomic mass unit.

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Recall that one atom of carbon-12 is assigned a mass of 12 atomic mass units (amu).

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One twelfth the mass of a carbon-12 atom is used to define a(an)

a. atomic mass.

b. mass number.

c. atomic number.

d. atomic mass unit.

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