The atomic mass of an element is a. the sum of the protons and neutrons in one atom of the element. b. twice the number of protons in one atom of the element. c. a weighted average of the masses of an element’s isotopes. d. a ratio based on the mass of a carbon-12 atom.
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The atomic mass of an element is a. the sum of the protons and neutrons in one atom of the element....
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