The ELEMENTS Z

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Across
  1. 4. group 9; in Vitamin B-12
  2. 5. an inner transitional element; used in electric motors
  3. 8. first radioactive element discovered
  4. 9. an Actinide; used in magnetostrictive smart materials
  5. 11. group 7; in amethyst gems
  6. 14. a Lanthanide; used in cataract surgery
  7. 15. group 5; in superconductors
  8. 17. an inner transitional element; used in MRIs
  9. 18. group 5; very elastic
  10. 19. the densest element
Down
  1. 1. 2 valence electrons; found in sparklers and talc
  2. 2. group 3; found in superconductors
  3. 3. found in emeralds
  4. 4. in atomic clocks
  5. 6. used in sports equipment
  6. 7. an Actinide; used in smoke detectors
  7. 10. 6 valence electrons; in dandruff shampoo
  8. 12. main group metal but not in groups 1 or 2; used in LEDs
  9. 13. TOXIC Noble Gas
  10. 16. found in fire sprinklers
  11. 20. semi-conductor used to make glass
  12. 21. found in liquid crystal displays