Structure Of Matter

12345678910111213141516171819
Across
  1. 1. chemical symbols with subscripts and coefficients that combines
  2. 4. Center of an atom
  3. 7. a single substance that has a defined composition
  4. 10. Smallest particles of an element
  5. 11. negatively charged particle
  6. 15. organization tool for each different type of element
  7. 17. the location outside the nucleus
  8. 18. shows the number of molecules involved
  9. 19. shows the number of atoms involved
Down
  1. 2. number of protons in an atom
  2. 3. super small particle
  3. 5. pure substance made up of only one type of atom
  4. 6. Anything with volume or mass
  5. 7. positively charged particle
  6. 8. made when 2 or more atoms join together
  7. 9. have no charged particle
  8. 12. 2 or more elements combine
  9. 13. and atom that has an equal amount of protons and neutron
  10. 14. average mass of protons and neutrons
  11. 16. 1-3 letter abbreviation that represents the type of atom