Chemistry CROSSWORD

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Across
  1. 1. The smallest particle of an element?
  2. 3. A positively charged ion is classified as?
  3. 4. The group 1 metals are called?
  4. 5. The group 7 elements are called?
  5. 10. the number of protons and neutrons in an atom are called?
  6. 11. atoms of the same element with the same number of protons but with different number of neutrons
  7. 17. Na
  8. 18. a substance that is formed when two or more electrons are chemically bonded together
  9. 19. Br
  10. 20. What are the horizontal lines called on the table?
Down
  1. 2. The last name of the creator of the periodic table?
  2. 6. Li
  3. 7. O
  4. 8. The attraction of oppositely charged ions?
  5. 9. A negatively charged ion is called?
  6. 12. a combination of two or more substances In which each pure substance retains its individual properties
  7. 13. The point at which a liquid becomes a gas?
  8. 14. a pure substance that cannot be broken down into simpler substances
  9. 15. What are the vertical columns called on the table?
  10. 16. A particle with no charge found in the nucleus?