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The remaining nuclear mass beyond the protons was explained by neutral particles called:
ANeutrons
BNeutrinos
CNucleases
DNutrients
Answer & Solution
Correct answer: A. Neutrons
1. Protons account for only half the mass or less.
2. Something uncharged supplies the rest.
3. Those particles are neutrons.
_Source: OpenStax Chemistry 2e, Chapter 2, Atoms, Molecules, and Ions._
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