Atomic radius of francium3/19/2023 ![]() The francium atom has a radius of 270.pm and it's Van der Waals radius is 348.pm. In its elemental form francium's CAS number is. The number of electrons in each of Francium's shells is 2,8,18,32,18,8,1 and its electronic configuration is 1s 2 2s 2p 6 3s 2p 6d 10 4s 2p 6d 10f 14 5s 2p 6d 10 6s 2p 6 7s 1. The element was discovered by French chemist Marguerite Catherine Perey of the Curie Institute in 1939 while analyzing the decay of actinium named for her country of origin, Francium would become the last naturally-occurring element to be discovered rather than being synthesized in a laboratory.įrancium is a S-Block, Group 1, Period 7 element. There are no commercial applications for francium because of its instability.ĭmitri Mendeleev predicted the existence of Francium in the 1870's, calling it “eka-caesium” because of its similarity to cesium (“eka” meaning one element down on the periodic table). Thus, scientists estimate that francium’s theoretical properties are similar to the other members of the alkali metals family. The element has never been observed in bulk with the lowest electronegativity of any element on the periodic table, it would immediately vaporize due to the extreme heat of decay. As such, only 20-30 grams of the element are present at any given time in the earth’s crust, limited to trace amounts in uranium and thorium ores.įrancium can be produced in the laboratory via bombardment of thorium with protons or radium with neutrons, but only in small quantities-the largest amount ever synthesized was a cluster of 30,000 atoms. ![]() A product of a disintegration of actinium, which undergoes beta-disintegration 99% of the time, francium is so highly radioactive that its most stable isotope (Francium-233, formerly known as actinium-K) has a half-life of merely 22 minutes. ![]() American Elements: The Materials Science Company™ | Certified bulk & lab quantity manufacturer of metals, chemicals, nanoparticles & other advanced materialsįrancium is the second rarest and the most unstable naturally occurring element on the periodic table only astatine is rarer. ![]()
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