The nature of matter

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Across
  1. 5. element used as a weapon in world war 1
  2. 6. what type of bond is formed when electrons are shared
  3. 7. action that draws water out of roots into stems of plants
  4. 8. structure that results when atoms are bonded together
  5. 11. the basic unit of life is?
  6. 12. a substance formed by chemical combinations
  7. 13. positively charged particle found in the nucleus
  8. 14. particle found in nucleus with no charge
  9. 15. type of bond formed when electrons are transferred
Down
  1. 1. process of liquid turning into vapor
  2. 2. what is the center of the atom called?
  3. 3. positively or negatively charged atoms
  4. 4. attraction between molecules of different substances
  5. 9. negatively charged particle found in the nucleus
  6. 10. process of vapor turning into liquid