make up almost all the mass of an atom​

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Answer:

Make up almost all the mass of an atom:

  • Neutrons are in every atom (with one exception), and they are bound together with other neutrons and protons in the atomic nucleus. Because protons and neutrons are so much more massive than electrons, almost all of the mass of any atom comes from the nucleus, which contains all of the neutrons and protons.

Explanation:

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