matter

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Across
  1. 2. a substance that has definite volume but on shape
  2. 4. a pure substance that cannot be broken down into simpler substances and that combines with other elements to form all other substances
  3. 5. a group of two or more atoms held together by very strong chemical bonds
  4. 6. negatively charged
  5. 8. a state of electrically charged matter that forms only at very high temperatures such as those existing in stars
  6. 10. that process by which a gas changes to a liquid
  7. 12. substances that are evenly distributed throughout
Down
  1. 1. a combination of substances in which the individual substances do not change or combine chemically
  2. 3. are not distributed evenly throughout
  3. 7. a pure substance that forms when two or more elements join chemically in fixed proportions
  4. 9. a substance that has neither definite shape nor volume
  5. 11. a substance that has a definite shape an volume