what does all atoms of a given isotope have what? is it true that the mass of a proton is much smaller than that of a neutron?

  1. what does all atoms of a given isotope have what?
  2. is it true that the mass of a proton is much smaller than that of a neutron?
  3. is it true that neutrons carry a neutral charge and and are found outside of the nucleus?
  4. Is it true that atomic radius describes the distance across an atom?

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