Chapter 9 Crossword

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Across
  1. 3. Have a negative electrical charge (-)
  2. 5. equal to the number of protons plus neutrons
  3. 6. 1 more electron than proton = (-) negative charge
  4. 9. Two atoms with different numbers of neutrons
Down
  1. 1. have no electrical charge
  2. 2. Equals the number of protons
  3. 4. 1 less electron than proton = (+) positive charge
  4. 7. have a positive charge (+)
  5. 8. often used for things that are too small or too large to be observed
  6. 9. An atom that carries an electrical charge