Francium - Wikipedia
Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain in which …
Francium | Radioactive, Alkali Metal, Rare | Britannica
francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group. It exists only in short-lived radioactive forms. Natural francium cannot be isolated in visible, weighable …
Francium - Element information, properties and uses | Periodic Table
Francium, number 87, was the last of these elements to be discovered in nature. From its position in the table, it was clear that element 87 would be a reactive alkali metal, the heaviest member of the family …
WebElements Periodic Table » Francium » the essentials
Francium is found in uranium minerals, and can be made artificially by bombarding thorium with protons. It is the most unstable of the first 101 elements. The longest lived isotope, 223 Fr, a daughter of 227 …
Francium Facts (Atomic Number 87 or Fr) - ThoughtCo
Jun 9, 2025 · Francium is a rare and highly unstable element with the atomic number 87 and symbol Fr. Discovered in 1939, francium decays quickly, making it the second rarest natural element after astatine.
Francium: Facts about the elusive radioactive element
Jul 26, 2022 · Francium — the 87th element on the periodic table — is a naturally occurring, but incredibly rare, radioactive element. It forms and decays extremely quickly, so it has no practical …
Francium Element Facts - chemicool.com
Francium is a heavy, unstable, radioactive metal with a maximum half-life of only 22 minutes. It has a low melting point (27 o C, 81 o F) and, if enough of it could be accumulated, it would be liquid in a …
Francium | Fr (Element) - PubChem
Francium, the heaviest known member of the alkali metals series, occurs as a result of an alpha disintegration of actinium. It can also be made artificially by bombarding thorium with protons. While …
Francium: Element 87 - Properties, History, and Uses
Francium is a highly radioactive element with the atomic number 87, belonging to the alkali metal group in the periodic table. Its general importance is more academic and research-based than practical due …
Periodic Table of Elements: Los Alamos National Laboratory
While it occurs naturally in uranium minerals, there is probably less than an ounce of francium at any time in the total crust of the earth. It has the highest equivalent weight of any element, and is the …