Particles and matter

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Across
  1. 1. negatively charged atoms
  2. 3. negatively charged
  3. 6. he said that the atom was like a plum pudding
  4. 8. vertical columns on the periodic table
  5. 11. horizontal columns on the periodic table
  6. 12. positively charged atom
  7. 15. pure substance
  8. 16. he did the gold foil experiment
  9. 18. positively charged
  10. 19. the outer shell
  11. 20. he proposed the idea of electron shells
Down
  1. 1. a particle made of protons, neutrons,electrons
  2. 2. contains protons and neutrons
  3. 4. positively charged or negatively charged atom
  4. 5. combination of different elements
  5. 7. a place where electrons orbit the nucleus
  6. 9. proton
  7. 10. H2O
  8. 13. no charge
  9. 14. electron
  10. 17. he said that elements form in simple ratios