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The atomic mass of an element is the sum of neutrons and A) atoms. B) electrons. C) isotopes. D) protons.
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The atomic mass of an element is the sum of neutrons and A) atoms. B) electrons. C) isotopes. D) protons.

User Abiieez
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Answer: D) protons.

The other option that would make the most sense would be electrons, however the mass of an electron is so small that is basically negligible, so it's not included in the atomic mass.
User Chvck
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