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.
钫（化学元素）_百度百科
钫（Francium）（台湾称鍅，旧译作鉣、錺）是一种放射性元素，化学符号是Fr，原子序数是87，是放射性元素Ac-227的α衰变产物，在自然界里极微量的存在。
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.
钫 - 维基百科，自由的百科全书
鍅 （英語： Francium；中國大陸、港澳译为 钫 fānɡ，台灣译为 鍅 fǎ），是一種 化學元素，其 化學符號 为 Fr， 原子序數 为87。 鍅是一種 放射性 極高的 金屬， 半衰期 很短，是前105種化學元素中穩定性最低的，比許多 超鈾元素 都要不穩定，其 同位素 會快速衰變成 砈 、 鐳 或 氡。 它最長壽的同位素——鍅-223的半衰期僅22分鐘。 鍅的 電負度 是所有元素第二低的，僅次於其上方的 銫。 鍅的 電子組態 為 [Rn] 7s 1，因此該元素被歸類為 鹼金屬。 塊體的鍅金屬從未被觀察到 …
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 any time in the entire crust of.
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 | 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 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.
Francium Element Facts - chemicool.com
Francium is the second rarest element in the Earth’s crust, next to astatine. Less than thirty grams of francium exists on Earth at any given time. Francium is the least electronegative of all the elements, therefore it should be the most chemically reactive alkali metal.
Francium | Fr | CID 6328145 - PubChem
2021年10月14日 · Francium atom is an alkali metal atom. ChEBI. 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.