chemistry crossword

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Across
  1. 2. / a substance made by mixing other substances together.
  2. 3. / Horizontal rows of elements.
  3. 7. / The vertical columns on the periodic table.
  4. 9. diagram / a method of writing the chemical symbol of an element and surrounding it with dots to show the number of valence electrons.
  5. 10. / The temperature when a liquid starts to vaporize.
  6. 13. / the around a nucleus where electrons are found.
  7. 17. / it is a shorthand method of representing an element.
  8. 18. / the amount of compactness in somthing.
  9. 20. / a stable particle with a negative electricity it found in all atoms and acting as the main carrier of electricity in solids.
Down
  1. 1. / exploding
  2. 4. / able to dissolve other substances.
  3. 5. / a stable particle occurring in all atoms it has positive charge.
  4. 6. / The temperature when a soled starts to liquidize.
  5. 8. / A table filled with elements in order of atomic numbers.
  6. 11. / the number of protons in the nucleus of an atom.
  7. 12. / a group of atoms bonded together.
  8. 14. / a particle about the same mass as a proton but with no charge.
  9. 15. / The center of a atom.
  10. 16. / when a solid formed from a solution.
  11. 19. / Good conductors of heat and electricity.