Matter

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Across
  1. 4. electrically charged particle
  2. 8. educated guess from research or observation
  3. 10. positively charged particle
  4. 12. anything that has mass and takes up space
  5. 13. vertical columns gives umber of valence electrons
  6. 15. refers to the number of protons
  7. 16. refers to the number of protons and neutrons
  8. 17. horizontal rows that show many energy shells
  9. 18. has a negative charge and little to no mass
  10. 19. does not have a charge but it has mass
Down
  1. 1. electrons number of electrons in outer shell
  2. 2. can be seen or measured
  3. 3. has a positive charge and it has mass
  4. 5. letter or group of letters representing an element
  5. 6. negatively charged particle
  6. 7. refers to how an element reacts
  7. 9. way to solve a problem
  8. 11. simplest form of matter
  9. 14. amount of matter in an object