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A mass number of 10 means the total of protons and neutrons is 10. It can be either:

  • Boron-10 has five protons and five neutrons but also can have 6 neutrons.
  • Beryllium-10 has four protons and six neutrons. It is very rare and decays to boron-10. Beryllium-9 is much more common with four protons and fiveneutrons.
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