Francium - Wikipedia
网页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. [4]
Francium - Element information, properties and uses | Periodic …
网页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
网页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 any time in the entire crust of Earth.
Francium
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Francium Facts - Atomic Number 87 Element Symbol Fr
网页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 | History, Uses, Facts, Physical & Chemical Characteristics
网页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) - Properties, Health effects & Uses of Francium
网页Francium is the least found metal on the planet earth and is rarely found in nature. It is considered to be the second rarest metal discovered on the earth’s crust next to the Astatine. Francium is an element with the chemical …
Francium - Periodic Table
网页Francium - Properties, history, name origin, facts, applications, isotopes, electronic configuation, crystal structure, hazards and more; Interactive periodic table of the chemical elements.
Chemistry of Francium (Z=87) - Chemistry LibreTexts
网页2023年6月30日 · 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 (22 minutes is the longest). 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.
Francium (Fr) – Periodic Table (Element Information & More)
网页2024年9月1日 · Francium is a highly radioactive element in the alkali metals group of periodic table. The most stable isotope of francium has a half-life of only 22 minutes. The atomic mass of most stable isotope of francium is …