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3 Written questions

3 Multiple choice questions

  1. one of two or more atoms with the same atomic number but with different numbers of neutrons
  2. the average mass of all the isotopes of an element
  3. a subatomic particle that has a negative charge

3 True/False questions

  1. mass numberthe sum of the number of neutrons and protons in an atomic nucleus

          

  2. electron clouda subatomic particle that has a negative charge

          

  3. protona subatomic particle that has a positive charge and that is found in the nucleus of an atom