Francium is an element with chemical symbol Fr and atomic number 87 in the periodic table. It is produced both by naturally and by artificial methods. Most probably, it is assumed that about 340-550 gms of this metal francium are found in the earth’s crust. Date: February 09, 2021 On the periodic table of elements, francium is identified with the symbol Fr, and it has an atomic number of 87. Francium is a radioactive chemical element which is classified among the alkaline earth metals on the periodic table. It is extremely unstable, with a very short half life — approximately 20 minutes —. Once the atomic numbers for all the known elements were assigned, it was clear seven elements were missing from the periodic table between hydrogen with atomic number 1, and uranium, number 92. Francium, number 87, was the last of these elements to be discovered in nature.
The existence of Francium was predicted by Dmitri Mendeleev in the 1870's and he presumed it would have chemical and physical properties similar to Cesium. Numerous historical claims to the discovery of element 87 were made resulting in the names Russium, Virginium, and Moldavium.
This element, which was named for France, was discovered in 1939 by Marguerite Perey, who was an assistant to Marie Curie, at the Curie Institute in Paris. There was a British team working to be the first to discover this element at the same time as a French team. The British team wanted to name the element 'Britium' - the French team discovered it first and named it after their country.
Francium was the last element discovered in nature. Originally named Actinium K, it occurs as a result of Actinium's alpha decay and can be artificially made by bombarding Thorium with protons. It is the heaviest alkali metal, but the next element to be discovered will most likely be an alkali metal even heavier than it.
Francium is a highly radioactive alkali metal that is found in very small amounts in Uranium and Thorium ores. It is also notable for having the lowest electronegativity and electron affinity of all the elements. Video converter for mac pc.
What Is Francium In
Francium is the last of the known alkali metals and does not occur to any significant extent in nature. All known isotopes are radioactive and have short half-lives (21.8 minutes is the longest).
Francium Atomic Number Mass
Due to the small amounts produced and its short half-life, there are currently no uses for Francium outside of basic scientific research.