Chemistry Bonus Crossword Puzzle

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Across
  1. 2. the sum of protons and neutrons
  2. 7. only the important numbers
  3. 12. horizontal rows on a periodic table
  4. 13. atoms of the same element with a different number of neutrons
  5. 14. four variables used to describe the location of electrons within an atom
  6. 15. a solution that contains more than the maximum about of solute capable of dissolving at a specific temperature
  7. 17. represented with an m
  8. 18. tend to form covalent bonds
  9. 19. produces bubbles, a precipitate, light, or a change in color/odor/temperature
Down
  1. 1. a mixture where individual particles cannot be distinguished
  2. 3. a combination of two or more pure substances
  3. 4. when oxygen combines with a substance and produces heat and light
  4. 5. a positively charged ion
  5. 6. this process can be increased through stirring, crushing, and heating
  6. 8. a non-uniform mixture
  7. 9. vertical columns on a periodic table
  8. 10. when one neutron changes to a proton, releasing an electron known as a beta particle
  9. 11. how close a measured value is to an accepted value
  10. 16. how close a series of measurements are to each other
  11. 20. represented with an M