Chemistry Crossword Puzzle

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Across
  1. 2. atom or molecule that has a charge becasue it has gained or lost electrons
  2. 3. the smallest particle thats made up of matter
  3. 7. Columns on the periodic table
  4. 9. Rows on the periodic table
  5. 10. allows us to change/convert between two units
  6. 11. subatomic particles that have a negative charge
  7. 15. used in a balanced chemical equation
  8. 17. ion with a negative charge e- are gained
  9. 18. Most reactive nonmetals
  10. 19. another name for percent yield
Down
  1. 1. Very reactive
  2. 4. Conduct electricity and heat
  3. 5. shows only the substances that undergo a change
  4. 6. most comment element in the universe
  5. 8. elements tend to be stable with eight valence electrons
  6. 12. electrons are shared
  7. 13. 1/12 the mass of a carbon-12 isotope
  8. 14. an atom with the same number of protons but a different number of neutrons
  9. 16. ion with a positive charge e- are lost
  10. 20. synthesis always forms solids