File: Francium.swf-(3.08 MB, Anime)
[_] Fr, 87 Anonymous 03/19/13(Tue)19:07 No.

  Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as
  eka-caesium and actinium K. It is one of the two least electronegative elements, the other being
  caesium. Francium is a highly radioactive metal that decays into astatine, radium, and radon. As
  an alkali metal, it has one valence electron.

>> [_] Anonymous 03/19/13(Tue)19:08 No.

  >>1919013
  Bulk francium has never been viewed. Because of the general appearance of the other elements in
  its periodic table column, it is assumed that francium would appear as a highly reflective metal,
  if enough could be collected together to be viewed as a bulk solid or liquid. However preparing
  such a sample is impossible, since the extreme heat of decay (its longest isotopic half life is
  only 22 minutes) would immediately vaporize any viewable quantity of the element.

>> [_] Anonymous 03/19/13(Tue)19:09 No.

  >>1919017
  Francium was discovered by Marguerite Perey in France (from which the element takes its name) in
  1939. It was the last element discovered in nature, rather than by synthesis. Outside the
  laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores,
  where the isotope francium-223 continually forms and decays. As little as 20–30 g (one ounce)
  exists at any given time throughout the Earth's crust; the other isotopes are entirely synthetic.
  The largest amount produced in the laboratory was a cluster of more than 300,000 atoms.

>> [_] Anonymous 03/19/13(Tue)20:00 No.

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>> [_] Anonymous 03/19/13(Tue)20:14 No.

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>> [_] Anonymous 03/19/13(Tue)20:16 No.

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