Ch 9 Justus Schroeder

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Across
  1. 3. average mass of the naturally occurring isotopes of an element
  2. 5. an electron in the outermost energy level of an atom
  3. 6. have a positive charge
  4. 7. have a negative electrical charge
  5. 8. number of protons
  6. 10. have no electrical charge
Down
  1. 1. determined by the number of electrons
  2. 2. equal to the number of protons plus neutrons
  3. 4. two atoms with different number of neutrons
  4. 9. an atom that carries an electrical charge