Francium is a chemical element with the symbol Fr and atomic number 87.
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Francium is a chemical element with the symbol Fr and atomic number 87.
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Francium-223 has a shorter half-life than the longest-lived isotope of each synthetic element up to and including element 105, dubnium.
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Francium is an alkali metal whose chemical properties mostly resemble those of caesium.
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Francium has a slightly higher ionization energy than caesium, 392.
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Francium should have a higher electron affinity than caesium and the Fr ion should be more polarizable than the Cs ion.
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Francium perchlorate is produced by the reaction of francium chloride and sodium perchlorate.
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Francium halides are all soluble in water and are expected to be white solids.
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Francium-223 is the most stable isotope, with a half-life of 21.
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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.
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Francium then published a thesis on his predictions of the properties of eka-caesium, in which he named the element russium after his home country.
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Francium was the last element discovered in nature, rather than synthesized, following hafnium and rhenium.
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Francium can be synthesized by a fusion reaction when a gold-197 target is bombarded with a beam of oxygen-18 atoms from a linear accelerator in a process originally developed at the physics department of the State University of New York at Stony Brook in 1995.
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Francium atoms leave the gold target as ions, which are neutralized by collision with yttrium and then isolated in a magneto-optical trap in a gaseous unconsolidated state.
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Francium has not been synthesized in amounts large enough to weigh.
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