Periodic Table and Reactions

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Across
  1. 3. the number of protons plus neutrons in the nucleus
  2. 6. number of electron energy levels for group 3 elements
  3. 8. the type of charge on an electron
  4. 9. number of valence electrons for chlorine
  5. 12. particles in the nucleus with protons
  6. 13. number of electrons needed to fill energy level 1
  7. 14. number of valence electrons for carbon
  8. 15. gas generated when reacting NaHCO3 and CH3COOH
  9. 17. electrons with the highest energy
Down
  1. 1. the number of protons in an element's atom
  2. 2. group number for argon
  3. 4. group number for sodium
  4. 5. group number for chlorine
  5. 7. particles orbiting outside the nucleus
  6. 10. vertical column on the periodic table
  7. 11. the type of charge on a proton
  8. 16. horizontal row on the periodic table
  9. 18. number of electrons needed to fill energy level 3