Chemistry crossword

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Across
  1. 2. The transition of colours
  2. 3. Non-metals bonding create ___ bonds
  3. 5. Metals and non-metals bonding create ___ bonds
  4. 6. Another example of pure substances besides elements
  5. 9. When you leave a metal object outside for long periods of time, it begins to ___
  6. 11. The right side of the periodic table
  7. 13. When two liquids create a solid
  8. 16. The transition of liquid to gas
  9. 17. Classifications of ____
  10. 19. A uniform mixture
  11. 20. In the periodic table, groups are also known as ____
Down
  1. 1. made up of only one kind of particles and has a fixed or constant structure
  2. 4. How breakable an object is
  3. 7. Another word for smell
  4. 8. A substance’s ability to let light flow through it
  5. 10. The number of protons and electrons in an atom
  6. 12. The left side of the periodic table
  7. 14. The ability of a substance to burn in air
  8. 15. The inbetween of non-metals and metals
  9. 18. Mass of an atom