• Isotopes are atoms that have the same atomic number, but different mass numbers due to a change in the number of neutrons.
  • Carbon has three natural isotopes, while some heavier elements can have many more.
  • Most elements naturally consist of mixtures of isotopes.
  • Carbon-13 behaves chemically in exactly the same way as the more plentiful carbon-12.
  • Tin has ten stable isotopes,.
  • the most of any element.
  • An isotope of barium (atomic number 56) has an mass of 138.
  • How many neutrons are in the nucleus of this isotope?
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