• Osmium
  Osmium

  A very hard, gray, toxic, and nearly infusible metal element, atomic number 76, atomic weight 190.2, symbol Os.<br/>
  MeSH
• Thallium
  Thallium

  A heavy, bluish white metal, atomic number 81, atomic weight [204.382; 204.385], symbol Tl.<br/>
  MeSH
• Uranium
  Uranium

  A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear...<br/>
  MeSH
• Fermium
  Fermium

  A man-made radioactive actinide with atomic symbol Fm, and atomic number 100. Its known isotopes range from 244-254 and 256-258. Its valence can be +2 or +3. Like einsteinium,...<br/>
  MeSH
• Potassium
  Potassium

  An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and ot...<br/>
  MeSH

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