1. atomic number 63 a bivalent and trivalent metallic element of the rare earth group
  2. atomic number 53 a nonmetallic element belonging to the halogens
  3. atomic number 66 a trivalent metallic element of the rare earth group
  4. atomic number 13 a silvery ductile metallic element found primarily in bauxite
  5. atomic number 43 a crystalline metallic element not found in nature
  6. atomic number 67 a trivalent metallic element of the rare earth group
  7. atomic number 36 a colorless element that is one of the six inert gasses
  8. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  9. atomic number 83 a heavy brittle diamagnetic trivalent metallic element
  10. atomic number 33 a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
  11. atomic number 61 a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
  12. atomic number 64 a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
  13. atomic number 93 a radioactive transuranic metallic element
  14. atomic number 23 a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite
  15. atomic number 60 a yellow trivalent metallic element of the rare earth group
  16. atomic number 62 a grey lustrous metallic element of the rare earth group
  17. atomic number 65 a metallic element of the rare earth group
  18. atomic number 68 a trivalent metallic element of the rare earth group
  19. atomic number 69 a soft silvery metallic element of the rare earth group
  20. atomic number 6 an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.