Periodic table crossword puzzle

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Across
  1. 4. A property of nonmetals
  2. 6. A property of metals
  3. 8. Most reactive nonmetals
  4. 10. Lanthanum is in this periodic table group
  5. 12. What group are noble gases in
  6. 13. What did Mendeleev look for in elements
  7. 16. What do nonmetals become when they are ions
  8. 18. What do nonmetals to to electrons
  9. 20. Can be shiny or dull
  10. 21. Extremely soft
  11. 22. What can be easy or hard to change in metalloids
  12. 23. What do metals become when they are ions
  13. 25. How many valance electrons does Ga have
  14. 26. What did Mendeleev organize the elements in order of increasing
  15. 27. Good conductor of heat and electricity
  16. 28. All of these are radioactive
  17. 29. Poor conductor of heat and electricity
Down
  1. 1. Have high melting and boiling points
  2. 2. What is the ionic charge of aluminum
  3. 3. oxidizes in air
  4. 5. Ionic charge of oxygen
  5. 7. Who is credited for designing for the first periodic table
  6. 9. What group are halogens in
  7. 11. Have characteristic colors when excited
  8. 14. What group are alkali metals in
  9. 15. Come from ores in earth's crust
  10. 17. What group are transition metals in
  11. 19. What do metals do to electrons
  12. 24. How many valence electrons does Cl have
  13. 25. What group are alkaline Earth metals in