Periodic table crossword

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Across
  1. 3. highly reactive, group 7A
  2. 4. ______ mass, protons+neutrons
  3. 6. _____ gas, not reactive
  4. 8. how reactive an element is
  5. 10. where metalloids are located
  6. 11. __________ metals,elements in groups 3-12
  7. 13. negative charge, not in nucleus
  8. 15. located on the right side of the periodic table
  9. 16. two letters representing an element
  10. 18. have properties of both nonmetals and metals
  11. 20. positively charged, in nucleus
Down
  1. 1. atoms with a different number of neutrons
  2. 2. electron ___________, how electrons are organized in orbitals
  3. 5. most of group 18/ 8A has 8 ______ electrons
  4. 7. most likely location of electrons
  5. 9. _____ of the stair step, where metals are located
  6. 12. neutral/ no charge, in nucleus
  7. 14. ____ of the stair step,where nonmetals are located
  8. 17. located on the left side of the periodic table
  9. 19. a charged group of atoms