Francium occurs as a result of α disintegration of actinium. Francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. Francium occurs naturally to a very limited extent in uranium minerals. Nevertheless it has been estimated that there might be from 340 to 550 grams of francium in the earth's crust at any one time. There are no commercial applications due to its instability and rarity in nature. There are a few problems with this idea: First off, francium is highly rare. just like all other alkali metals of group 1, francium on treating with water forms FrOH that is francium hydroxide. Properties: The melting point of francium is 27 °C, its boiling point is 677 °C, and its valence is 1. This is because it is a very weak radioactive element. This explosion is the result of the bomb, causing much destruction. Francium in Water When you add a small amount of francium to water a huge explosion will happen. It is the second rarest natural element, following astatine. Francium has been used in research purpose only [3]. Francium is the heaviest known member of the alkali metals series. Francium is found in uranium minerals, and can be made artificially by bombarding thorium with protons. The longest lived isotope, 223 Fr, a daughter of 227 Ac, has a half-life of 22 minutes. Natural francium cannot be isolated in visible, weighable amounts, for only 24.5 grams (0.86 ounce) occur at any time in the entire crust of In each reaction, hydrogen gas is given off and the metal hydroxide is produced. It is the most unstable of the first 101 elements. Francium is the most electropositive element and is the most reactive one among the alkali metals. The picture below shows the reaction. Natural Francium-223 is the result of the alpha decay of actinium-227 and can be found in trace amounts in uranium and thorium minerals. Health Hazards. Francium is the second rarest element in the crust, after astatine. It exists only in short-lived radioactive forms. It is the second-least electronegative element, following cesium. Francium is very scarce and expensive. Were francium ever to be burned in air, the result is expected to be francium superoxide, FrO 2. A fresh francium surface would soon tarnish because of reaction with oxygen and moisture from the air. Nearly all francium salts are water soluble. Francium has no known biological role in human life. Significance and Uses. Fr(s) + O 2 (g) → FrO 2 (s) Reaction of francium with water. but this reaction is highly EXOTHERMIC ,so much that an explsion is likely to happen. H20 (water) is forced into the chamber holding the chunk of francium, creating a reaction, which in turn causes a grand explosion. 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