Chemistry unit

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Across
  1. 2. a thin layer of metal
  2. 6. basic unit of a chemical element
  3. 8. created the periodic table
  4. 12. a part/aspect of abstract
  5. 13. a group of atoms
  6. 14. a subatomic particle in all atomic neclie
  7. 15. (5 words) discovery that mass's nor destroyed in chemical reactions
  8. 20. a subatomic particle same mass as a proton without electric charge
  9. 21. a mixture
  10. 22. 8A-0. Helium, neon, Argon arts some examples
  11. 23. arranged in order of increasing atomic number
  12. 24. a central most important part of an object
Down
  1. 1. with exception of hydrogen. Left hand column of the periodic table
  2. 2. multiplying quantities
  3. 3. a column
  4. 4. noble gases, groups 14-16
  5. 5. Associated with an atom
  6. 7. a shortcut (ex:zinc-Zn)
  7. 9. a substance undergoes change
  8. 10. a release of heat
  9. 11. number of protons
  10. 16. mass of an atom
  11. 17. of or related to an orbit or orbits
  12. 18. absorbance of heat
  13. 19. boron, silicon, germanium, arsenic, antimony, tellurium, and polonium