Properties of state and matter

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Across
  1. 2. adding or removing this makes substances
  2. 3. Heat causes molecules of a solid to ( ) form each other, making the solid become a liquid.
  3. 5. the number of ( ) in an atom determines what element it is.
  4. 7. an ( ) is the smallest unit of an element that retains the properties of the element.
  5. 9. scientists write symbols for compounds called what?
  6. 10. about three-fourths is the elements are what?
  7. 12. Each ( ) has its own density
  8. 13. when molecules are linked in organized positions, a ( ) results.
  9. 14. a measure of how tightly packed matter is is called what?
  10. 17. The basic building blocks of all matter are what?
Down
  1. 1. In 1869,Mendeleyev found that the properties of the elements went through what?
  2. 4. when a liquid ( ), it gradually changes to a gas.
  3. 6. The subscripts in chemical formulas tell us the ( )of particles that combine in a compound.
  4. 8. When water absorbs enough heat, it turns into a(n) ( ) called steam.
  5. 11. ( ) come from petroleum
  6. 15. when a substance is melting or boiling, its ( ) stays the same
  7. 16. an object's ability to float is called its what?