6th grade - Physical Science

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Across
  1. 4. changes from a liquid to a solid
  2. 6. process which gas becomes a liquid
  3. 8. the smallest particle of an element
  4. 13. process which a liquid turns into a gas
  5. 14. a definite shape and volume
  6. 15. changes from a solid to a liquid
Down
  1. 1. a system used to organize elements
  2. 2. a gas turns directly to a solid
  3. 3. in nucleus of an atom; positive charge
  4. 5. in nucleus of an atom; neutral charge
  5. 7. central part of an atom
  6. 9. definite volume but no definite shape
  7. 10. process which a solid turns in
  8. 11. found around the nucleus; negative charge
  9. 12. no fixed volume or shape