Gourt > Science > Chemistry > Elements > Francium
Francium is a chemical element in the periodic table that has the symbol Fr and atomic number 87. This is a highly radioactive alkali metal that is found in very small amounts in uranium and thorium ores.
Characteristics
This element, which was named for France, was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris. Francium was the last element discovered in nature. It is the heaviest alkali metal and occurs as a result of actinium's alpha decay and can be artificially made by bombarding thorium with protons.
Even though it naturally occurs in uranium minerals, it has been estimated that there might be from 340 to 550 grams * of francium in the earth's crust at any one time, making it the second rarest element in the crust, next to astatine. It is also the most unstable element among the first 101 and has the highest equivalent weight of any element. Francium is the least electronegative of all the known elements, with caesium as its runner up.
More on [ Francium ]
*francium with water
ASquirrelPig (Hayley Stephen) Mon, 07 Dec 2009 20:22:17 -0000
*francium with water
ã¾ã 殿å å ¥ããã¦ãªãã£ããã ã¨â¦â¦? ã¿ã¦ããªã: ãåé³ãã¯ã Francium ããªãªã¸ãã«æ²ãâãã³ãã³åç»(9) http://www.nicovideo.jp/watch/sm6460566
tadsan (ç½äºç¾©äºº/絶æã®è¹è¶åä½ç¾æ¬¡ç·ã¨å¿ åãã) Mon, 07 Dec 2009 11:56:58 -0000
まだ殿堂入りしてなかった、だと……? みてるなう: 【初音ミク】 Francium 【オリジナル曲】‐ニコニコ動画(9) http://www.nicovideo.jp/watch/sm6460566
RT[tadsan:VP3]http://www.nicovideo.jp/watch/sm6460566 VOCALOID殿å å ¥ãç´åãç¾å¨99,785ãã¿ã¦ããªã: ãåé³ãã¯ã Francium ããªãªã¸ãã«æ²ãâãã³ãã³åç»(9)
vocaloidbot (VOCALOID bot) Mon, 07 Dec 2009 00:00:11 -0000
RT[tadsan:VP3]http://www.nicovideo.jp/watch/sm6460566 VOCALOID殿堂入り直前。現在99,785。みてるなう: 【初音ミク】 Francium 【オリジナル曲】‐ニコニコ動画(9)
VOCALOID殿å å ¥ãç´åãç¾å¨99,785ãã¿ã¦ããªã: ãåé³ãã¯ã Francium ããªãªã¸ãã«æ²ãâãã³ãã³åç»(9) http://www.nicovideo.jp/watch/sm6460566
tadsan (ç½äºç¾©äºº/絶æã®è¹è¶åä½ç¾æ¬¡ç·ã¨å¿ åãã) Sun, 06 Dec 2009 22:44:44 -0000
VOCALOID殿堂入り直前。現在99,785。みてるなう: 【初音ミク】 Francium 【オリジナル曲】‐ニコニコ動画(9) http://www.nicovideo.jp/watch/sm6460566
My to-do's for the day: study Orgo, laundry, and try to spend time with my boy. :)
francium (Fran) Sat, 05 Dec 2009 17:05:42 -0000
My to-do's for the day: study Orgo, laundry, and try to spend time with my boy. :)
RT[Ceripher] åããã: éçæ²ã¯å¤§å¤ãªFranciumãçãã§ããã¾ããâãã³ãã³åç»(9) http://www.nicovideo.jp/watch/sm6544343
nicosalv (ãã³ç¿) Fri, 04 Dec 2009 10:50:10 -0000
RT[Ceripher] 合いすぎ: 魔理沙は大変なFranciumを盗んでいきました‐ニコニコ動画(9) http://www.nicovideo.jp/watch/sm6544343
ChemGlobe: Francium - Electronic, thermal, and steric data along with an isotope table.
Meta Description: [ The chemical element [Fr] - Francium - Datasheet ]
ChemicalElements.com: Francium - Basic information, atomic structure, and isotopes table.
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EnvironmentalChemistry.com: Francium - Atomic structure, chemical and physical properties, and table of nuclides.
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Francium - Data tables and historic information.
Francium Spectroscopy - Research group at the State University of New York at Stony Brook. History, facts, trapping information, and production.
It's Elemental: Francium - Basic physical and historical information.
Meta Description: [ The Element Francium - Basic Physical and Historical Information ]
LANL: Francium - Basic information and history.
Lenntech: Francium - Physical data and chemical properties.
Meta Description: [ chemical properties, health and environmental effects of francium ]
Visual Elements: Francium - Image, general and physical information, and key isotopes.
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WebElements: Francium - Extensive information on history and properties.
Meta Description: [ This WebElements periodic table page contains key information for the element francium ]
Wikipedia: Francium - Properties of the element, including its history and characteristics.
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