periodic table

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Across
  1. 3. -type of bond when nonmetals bond together
  2. 4. -element found in high levels in bananas
  3. 8. -type of bond when metals bond together
  4. 9. -second most abundant metal in earth's crust
  5. 11. -type of bond when metals bond with nonmetals
  6. 15. -element that is poisonous and accumulates in the body because it is stored in fats
  7. 17. -only nonmetal element that is liquid at room temperature
  8. 19. -down the periodic table all have the same number of electrons in their outer orbital
  9. 20. -elements along the stairstep line
Down
  1. 1. -element is added to pool water as a disinfectant
  2. 2. -used in medicine to diagnose digestive disorders
  3. 5. -type of elements found to the left of the stairstep line
  4. 6. -Russian scientist who organized the first periodic table of elements based on atomic weight
  5. 7. -atoms with a negative charge
  6. 10. -element used in balloons and blimps
  7. 12. -type of elements found to the right of the stairstep line
  8. 13. -element used in batteries
  9. 14. -across the periodic table,all have the same number of electron orbitals
  10. 16. -coinage metal used in wiring
  11. 18. -metals form these positively charged ions