| 11. | In 1939, Perey discovered the element francium by purifying samples of lanthanum that contained actinium.
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| 12. | Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable.
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| 13. | So even the " meaning " of a melting point for francium is a bit obscure.
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| 14. | I don't think you need a citation for saying that francium salts are expected to be soluble.
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| 15. | Francium does not exist for long enough to be able to react with water due to its extreme instability.
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| 16. | Francium-221 then decays into astatine-217 by alpha decay ( 6.457 MeV decay energy ).
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| 17. | Francium's ability to be synthesized, trapped, and cooled, along with its relatively simple quantum theory.
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| 18. | "' Francium "'is a chemical element that has the symbol Fr and atomic number 87.
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| 19. | All other previous purported discoveries of element 87 were ruled out due to francium's very limited half-life.
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| 20. | An example is the separation of francium from other radioactive elements by coprecipitating it with caesium salts such as caesium perchlorate.
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