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Francium-223 is the most stable isotope, with a half-life of 21.8 minutes, [8] and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized. [22] Francium-223 is a fifth product of the uranium-235 decay series as a daughter isotope of actinium-227; thorium-227 is the more common daughter. [23]
However, it would appear that francium perchlorate has been formed, as it coprecipitates with caesium perchlorate, and several other insoluble francium salts are similarly known (Hyde, E.K., Radiochemical Methods for the Isolation of Element 87 (Francium), J. Am. Chem. Soc., 1952, 74, 4181) The article also quotes a value for the Pauling ...
Those that may in the future be found to be radioactive are expected to have half-lives longer than 10 22 years (for example, xenon-134). [citation needed] In April 2019 it was announced that the half-life of xenon-124 had been measured to 1.8 × 10 22 years.
In particular, the presence of long-lived (on the order of 10 9 years) nuclei of elements 124 and 126, along with their decay products, at an abundance of 10 −11 relative to their possible congeners uranium and plutonium, was conjectured. [67]
Francium (87 Fr) has no stable isotopes, thus a standard atomic weight cannot be given. Its most stable isotope is 223 Fr with a half-life of 22 minutes, occurring in trace quantities in nature as an intermediate decay product of 235 U. Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable.
Good work Cryptic! -- Rmrfstar 22:24, 18 April 2007 (UTC) Alrighty, I removed the solubility statement. Although it did come from an encyclopedia, the information therein may not have been updated in several years. Also, Hyde's experiment directly contradicted the statement. I do mean that Hulubei's work was accurate, not just "good".
Using 1992 interview footage of Gacy — filmed two years before his execution — this docuseries goes into his past and the investigation that led to his arrest.
Perey named the element francium, after her home country, and it joined the other alkali metals in Group 1 of the periodic table of elements. [3] [7] Francium is the second rarest element (after astatine) — only about 550g exists in the entire Earth's crust at any given time — and it was the last element to be discovered in nature.