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Rare element

  1. Sep 1, 2005 #1
    I read somewhere that francium is one of the rarest elements and that the entire planet contains only about 17 atoms of it . I really wondered if this was right and if so how could they know the number of atoms and also does this make it the most valuable substance i.e. the rarest or totally valueless since there is not enough to do anything with?
  2. jcsd
  3. Sep 1, 2005 #2


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    Staff: Mentor

    from http://www.webelements.com/webelements/elements/text/Fr/key.html
    As the article state, Fr is a daughter product of Actinium, which itself is a daughter product of another radionuclide, and they are part of the decay of uranium, U-235.

    See U-235 decay series at - http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/radser.html#c1
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