chemistry crossword puzzle

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Across
  1. 4. / do NOT add mass to the atom
  2. 7. / ability of it to dissolve
  3. 8. / an electrically charged element formed from the movement of electrons
  4. 11. / add mass to the atom
  5. 13. / how closely spaced the atoms are
  6. 14. / pure substance that cannot be broken down into something simpler by chemical means
  7. 16. / amount of matter in an object
  8. 17. / measure of the force of gravitation pull on a object
  9. 18. / is the physical form in which a substance exits,such as a solid, liquid, or gas
  10. 19. / will never change, because if you change the number of protons, you change the atom
Down
  1. 1. / liquid to solid mixture
  2. 2. / refers to only liquids + gases and means how fast or slow it flows
  3. 3. / touching the staircase line
  4. 5. / amount of space something takes up
  5. 6. / a substance made up of 2 or more elements chemically combined
  6. 9. / the basic unit of all matter
  7. 10. / made up of atoms
  8. 12. / solid to solid mixture
  9. 15. / composed of 2 or more compounds physically combined
  10. 16. / all the elements to the left of the staircase line ( except H)