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 it appears), has a half-life of only 22 minutes.
Francium - Element information, properties and uses | Periodic …
Element Francium (Fr), Group 1, Atomic Number 87, s-block, Mass [223]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
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 amounts, for only 24.5 grams (0.86 ounce) occur at …
The Element So Radioactive That It Hardly Exists - IFLScience
2024年10月15日 · For many years, the very existence of francium was a matter of conjecture. It was Dmitri Mendeleev - the father of the periodic table - who first theorized that there might be an undiscovered...
Francium: Facts about the elusive radioactive element
2022年7月26日 · 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 uses, and it...
Francium | History, Uses, Facts, Physical & Chemical Characteristics
Francium is the shiny metal in its pure state and exist in liquid form at room temperature rather than a solid. Francium belongs to alkali group of the periodic table so its physical properties are similar with alkali group elements.
Francium | Fr (Element) - PubChem
Francium is a chemical element with symbol Fr and atomic number 87. Classified as a n alkali metal, Francium is a solid at room temperature. B. Cordero, V. Gómez, A.E. Platero-Prats, M. Revés, J. Echeverría, E. Cremades, F. Barragán, S. Alvarez, Dalton Trans. 2008, 21, 2832-2838. DOI:10.1039/b801115j PMID:18478144.
Francium (Fr) - Definition, Preparation, Properties, Uses, …
2024年6月26日 · Francium is a chemical element with significant scientific intrigue, primarily due to its rarity and position in the periodic table. As the heaviest known alkali metal, Francium exhibits unique properties that captivate chemists and educators.
Francium | Fr | CID 6328145 - PubChem
2021年10月14日 · Francium atom is an alkali metal atom. A radioactive alkali metal with the atomic symbol Fr, and atomic number 87. The mass numbers of known isotopes are 204-213, 217-224. Its valence is +1. Computed by PubChem 2.2 (PubChem release 2021.10.14)
Periodic Table of Elements: Los Alamos National Laboratory
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 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.