science

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Across
  1. 4. not responding situation
  2. 5. the mass of the element
  3. 6. number of protons in the nucleus
  4. 11. an expression that shows the compound of an element
  5. 12. solid
  6. 13. either a liquid or gas
  7. 14. most important part of an object
  8. 15. combining atoms
Down
  1. 1. arranged in rows and groups
  2. 2. atom with neutral charge
  3. 3. One of the four principal conditions in which matter exists
  4. 7. atom with positive charge
  5. 8. acting in response to a situation rather than creating or controlling it.
  6. 9. atom with negative charge
  7. 10. gases like helium-neon and argon
  8. 11. letters on an element