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3 Written questions

3 Multiple choice questions

  1. center of an atom made up of protons and neutrons
  2. a region around the nucleus of an atom where electrons are likely to be found
  3. the average mass of all the isotopes of an element

3 True/False questions

  1. mass numberthe smallest component of an element having the chemical properties of the element


  2. electrona subatomic particle that has a negative charge


  3. isotopeone of two or more atoms with the same atomic number but with different numbers of neutrons