atomic theory

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Across
  1. 5. last energy ring electrons
  2. 6. neutral subatomic particle
  3. 8. atoms with modified mass
  4. 9. negative subatomic particle
  5. 10. negatively charged atom
Down
  1. 1. positive subatomic particle
  2. 2. positively charged atom
  3. 3. atoms with modified electrons
  4. 4. found the proton
  5. 7. positive center of atom