Periodic table and atomic structure

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Across
  1. 2. chemistry does not have carbon, mostly metals
  2. 4. any change in chemical property
  3. 7. neutral particle within nucleus
  4. 8. horizontal row in periodic table, number of electron shells/energy levels
  5. 10. nonmetal elements combined
  6. 13. CHON contains carbon,was living,is living or might be part of a living thing in future
  7. 16. positive particle within nucleus
  8. 17. vertical column in periodic table,same number of valence electrons
  9. 18. negative particles found outside of nucleus
  10. 19. positively charged atom, lost electrons
  11. 20. anything with mass and takes up space
  12. 21. color,shape,solid,liquid,gas,texture
Down
  1. 1. solid, liquid, gas, plasma
  2. 3. any change in physical property
  3. 5. negatively charged atom, gained electrons
  4. 6. reactive,corrosive,toxic,inert,flammable
  5. 9. the number of protons,how we i.d.an element
  6. 11. metal and nonmetal elements combined
  7. 12. the study of matter and energy
  8. 14. purest form of matter 118 of them now
  9. 15. useful tool containing the elements
  10. 20. the heaviness of the elements, proton+neutrons