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Physics · Oct / Nov 2016 · Paper 11 · Question 40

5054The nucleus

Which number is always equal to the proton number of a neutral atom of a radioactive isotope?

  1. Athe number of electrons in the atom
  2. Bthe number of neutrons in the atom
  3. Cthe number of nucleons in the atom
  4. Dthe number of particles in the atom

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Correct answer: A. the number of electrons in the atom

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