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Among isotopes of any particular element, the number of _____ can vary, and therefore the mass number of the element will vary.

User Fchancel
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Answer: neutrons

Step-by-step explanation:

  • An isotope has the same number of protons as well as electrons.
  • Therefore, only the number of neutrons can change.
  • The mass number is the total number of protons and neutrons, so it would also change.

User Miskohut
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