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Across
  1. 2. state of matter with no definite shape or volume
  2. 3. subatomic particles that dictates an atoms isotope
  3. 5. a table of elements organized by energy levels and number of protons and electrons
  4. 8. positively charged subatomic particles that dictate element
  5. 10. vertical column of the periodic table
  6. 12. state of matter with definite shape and volume
  7. 13. the mass of an atom
  8. 15. horizontal rows of the periodic table
  9. 18. anything that takes up space
  10. 19. purest form of matter
  11. 20. outermost electron(s)
Down
  1. 1. liquid turning into gas
  2. 4. negatively charged subatomic particles with little to no mass
  3. 6. the smallest form of matter
  4. 7. state of matter with definite volume and no definite shape
  5. 9. how many protons are in an atom
  6. 11. gas turning into a liquid
  7. 14. solid turning into a liquid
  8. 16. liquid turning into solid
  9. 17. high temperature gas