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 …

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 …

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。本身带有放射性，Fr-223 …

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 …

Element Francium (Fr), Group 1, Atomic Number 87, s-block, Mass [223]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Francium is formed by radioactive decay of actinium, and artificially made by bombarding thorium with protons. It is naturally present in uranium and consider the second rarest element in the …

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. …

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 …

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 …

2018年5月21日 · Francium is an alkali metal, a member of Group 1 (IA) in the periodic table. The periodic table is a chart that shows how chemical elements are related to each other. …