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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]
The CsFr molecule is predicted to have francium at the negative end of the dipole, unlike all known heterodiatomic alkali metal molecules. Francium superoxide (FrO 2) is expected to have a more covalent character than its lighter congeners; this is attributed to the 6p electrons in francium being more involved in the francium–oxygen bonding. [4]
I don't think it gives a direct and simple answer to why francium has a short half life, but lots of good relevant information and theory is presented. SemanticMantis 15:33, 18 June 2017 (UTC) Additional good stuff at Semi-empirical mass formula, valley of stability, and magic number_(physics). The magic numbers and semi-empirical bits lead to ...
francium: 87: 1b: Due to its very short half-life, there is almost no potential for a living thing to be exposed to it. Even synthesis cannot produce more than minute quantities before it decays, so there is no medical use. [11] Radioactive. [11] gadolinium: 64: 2ac: Has no known function in humans, and is not taken up by plants. [11]
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 ...
The football program was the intercollegiate American football team for Florida Institute of Technology located in the U.S. state of Florida. The team competed in the NCAA Division II and were members of the Gulf South Conference. Florida Tech's first football team was fielded in 2013. They played at the Florida Tech Panther Stadium. The ...
If sodium is to be placed above potassium then what about ceasium and francium?182.55.242.11 14:17, 9 July 2011 (UTC) K is indeed more reactive than Na, which is indeed more reactive than Li. This can be proven with a simple experiment in which you drop a small piece of each metal into separate beakers of water.
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.