1. atomic number 37 a soft silvery metallic element of the alkali metal group
  2. atomic number 77 a heavy brittle metallic element of the platinum group
  3. atomic number 47 a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography
  4. atomic number 35 a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
  5. atomic number 17 a common nonmetallic element belonging to the halogens
  6. atomic number 32 a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite
  7. atomic number 67 a trivalent metallic element of the rare earth group
  8. atomic number 87 a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
  9. atomic number 27 a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
  10. atomic number 36 a colorless element that is one of the six inert gasses
  11. atomic number 73 a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
  12. 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
  13. atomic number 97 a radioactive transuranic element
  14. atomic number 30 a bluish-white lustrous metallic element
  15. atomic number 31 a rare silvery metallic element
  16. atomic number 34 a toxic nonmetallic element related to sulfur and tellurium
  17. atomic number 38 a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
  18. atomic number 39 a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys
  19. atomic number 57 a white soft metallic element that tarnishes readily
  20. atomic number 3 a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals