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The atomic mass of an element is

Aa weighted average of the masses of an element’s isotopes.
Btwice the number of protons in one atom of the element.
Cthe sum of the protons and neutrons in one atom of the element.
Da ratio based on the mass of a carbon-12 atom.

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samchezo

Answer:C

Explanation: atomic mass is the total mass of a single atom. It is the sum of the the number of protons and neutrons in the atom.

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