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 | 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 …
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.
The Element So Radioactive That It Hardly Exists - IFLScience
2024年10月15日 · As it happens, the metal’s only naturally-occurring isotope - francium-223 - forms during the radioactive decay of actinium.
Francium Facts - Atomic Number 87 Element Symbol Fr
2020年10月22日 · Francium is a radioactive element with atomic number 87 and element symbol Fr. While this alkali metal occurs naturally, it’s very rare. It’s also highly reactive and unstable, so it’s not an element you’ll encounter in daily life. It’s probably a silver-colored liquid metal at room temperature, but so little exists that no one knows for certain.
Francium Facts (Atomic Number 87 or Fr) - ThoughtCo
2019年11月4日 · Francium is a highly radioactive alkali metal with the atomic number 87 and element symbol Fr. Although it occurs naturally, it decays so quickly it's very rare. In fact, scientists have never had a large enough sample of francium to know what it actually looks like!
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: 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...
Francium - Simple English Wikipedia, the free encyclopedia
Francium is a chemical element with the chemical symbol Fr and an atomic number of 87. It is a metal. In chemistry it is placed in a group of metal elements named the alkali metals. Francium is very radioactive. It is in very small amounts in uranium and thorium ores.
Francium (Fr) Element: Properties, Reactions, Hazard - Science Info
2023年10月9日 · Francium is a chemical element with the atomic number 87 and it is represented by the symbol ‘Fr’ in the periodic table. It belongs to Group 1 and Period 7 of the periodic chart. It is classified as an alkali metal. It is a soft, low-melting, silvery-white metal.