science-matter

1234567891011121314151617181920
Across
  1. 3. the column vertical
  2. 5. are tiny particles that make up matter
  3. 7. numbers of protons but different numbers of neutrons in their nuclei
  4. 9. is neutral
  5. 12. protons
  6. 14. electron
  7. 16. made the gold foil experiment
  8. 17. made the plum pudding model
  9. 19. a positively charged ion
Down
  1. 1. H2O
  2. 2. the column horizontal
  3. 4. made up the atomic theory
  4. 6. is positively charged
  5. 8. a pure substance
  6. 10. is the center part composed of protons and neutrons
  7. 11. are made up of two or more different elements
  8. 13. is a atom or molecule with a net electric charge due to the loss or gain of one or more electrons
  9. 15. is negatively charged
  10. 18. it holds electrons
  11. 20. a negatively charged ion