Atomic Structure Crossword

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Across
  1. 3. If isotopes have too many neutrons, they may become unstable or ________
  2. 4. The lightest element on the periodic table
  3. 5. A subatomic particle with a neutral charge found in the nucleus
  4. 10. The man who discovered electrons
  5. 13. Tiny pieces of matter that make up everything
  6. 14. How atoms are often drawn or modeled; an improvement on the planetary model
  7. 15. A positively-charged subatomic particle found in the nucleus
  8. 16. Where you can find most information about the elements
  9. 17. The element that makes up half of table salt
  10. 19. What electrons orbit around
  11. 20. What ions with the same charge do
Down
  1. 1. A negatively-charged subatomic particle
  2. 2. A number found on the periodic table that shows an element's mass
  3. 6. The Greek philosopher who first proposed the Atomic Theory
  4. 7. Atoms of the same elements with different numbers of neutrons are called _____
  5. 8. This number shows how many protons and electrons an element has
  6. 9. The element Rutherford used in his experiment when he discovered the nucleus
  7. 11. The element that makes up most of air
  8. 12. An atom with an unequal number of protons and electrons
  9. 18. Round the atomic mass to find this.