Chemistry Cross word

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Across
  1. 2. stopped by aluminum foil
  2. 3. stopped by paper
  3. 5. bond between 2 non metals
  4. 6. pass through human body
  5. 8. simillar chemical properties
  6. 10. at least 2 elements chemically combined
  7. 11. based on valence electrons
  8. 13. in the nucleus
  9. 15. nobel gases
  10. 16. ex: salad
  11. 17. in other words atomic number
  12. 19. same element with the same number of protons but different neutrons
  13. 20. number of energy levels
Down
  1. 1. measured in grams
  2. 2. also called planetary model
  3. 4. negative charge
  4. 7. bond between a mental and non metal
  5. 9. closeness of the data
  6. 12. a charged element
  7. 14. electronegativity, ioniazation, atomic radius, and sheilding are all examples of
  8. 18. ex: Pure Water