Chem Review.

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Across
  1. 3. elements found between group II and III
  2. 5. positively charged ion
  3. 7. sum if protons and neutrons
  4. 9. found in group 7
  5. 12. most reactive halogen
  6. 13. has stable electron arrangement
  7. 15. active part of air
  8. 18. the only metal that exist in liquid form
  9. 19. forms an amphoteric oxide
  10. 20. bonding formed when electrons are transferred
Down
  1. 1. first noble gas in the periodic table
  2. 2. same as atomic number
  3. 4. bonding formed when electrons are shared
  4. 6. determined by number of occupied energy levels
  5. 8. bonding formed when electrons shared come from only one atom
  6. 10. atomic number 11
  7. 11. negatively charge ion
  8. 14. can be placed in group I or VII
  9. 16. determined by electrons in outermost energy level
  10. 17. subatomic particle with no charge