FRANCIUM

frănˈsēəm [from France], radioactive chemical element; symbol Fr; at. no. 87; mass no. of most stable isotope 223; m.p. about 27 degrees Celsius (estimated); b.p. 677 degrees Celsius (estimated); sp. gr. unknown; valence +1. Francium is extremely rare; its most stable isotope (half-life about 22 minutes) occurs naturally, to a very limited extent, in uranium minerals. More than 30 other isotopes of francium are known; some are prepared by bombarding thorium with protons, deuterons, or alpha particles. Francium is one of the alkali metals found in group Ia of the periodic table. Because it is so rare, its chemical and physical properties are not known, but it is believed to resemble cesium. The element was discovered in 1939 by Marguerite Perey at the Curie Institute in Paris as a product of the radioactive disintegration of actinium. In the United States it was at one time called virginium.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Francium
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books on: Francium  - 35 results

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1.
Fundamental Concepts of Inorganic Chemistry
Book by Esmarch S. Gilreath; McGraw-Hill, 1958
Subjects: Chemistry, Inorganic
...and +5 oxidation states. 8.28 Francium . In 1930 F. Allison claimed the detection...branched disintegration Sec. 8.6 with francium as the minor product. The 1.2 per cent disintegration into francium is indicated in Table 8.5. Mlle Perey...
2.
The History and Use of Our Earth's Chemical Elements: A Reference Guide
Book by Robert E.Krebs; Greenwood Press, 1998
...compounds are very useful to humans. * * * FRANCIUM Alkali Metals SYMBOL: Fr ATOMIC NUMBER...COMMON ISOTOPES: No stable atoms of francium exist in nature. All isotopes are radioactive. The major isotope is actinium-K francium-223 , which is a decay product from...
3.
Notable Women in the Physical Sciences: A Biographical Dictionary
Book by Benjamin F. Shearer, Barbara S. Shearer; Greenwood Press, 1997
Subjects: Women Physical Scientists--Biography
name "francium" for the new element, in honor of her...chromatography to isolate a nearly pure sample of francium, but it took another scientist, Earl...also studied the relationships between francium and cancerous organs to see whether francium...
4.
How It Works: Science and Technology - Vol. 1
Includes: Abrasive - Antiaircraft Gun
Book by Marshall Cavendish; Marshall Cavendish, 2003
Subjects: Science--Encyclopedias, Technology--Encyclopedias
...potassium iodide are used in photography. Rubidium, cesium, and francium Rubidium was formerly recovered from process- ing lithium...could be useful as fuels in ion propulsion for space travet. Francium is a very short-lived radioactive alkali metal that rap...
5.
Encyclopaedic Dictionary of Physics: General, Nuclear, Solid State, Molecular, Chemical, Metal and Vacuum Physics, Astronomy, Geophysics, Biophysics, and Related Subjects - Vol. 2
Book by J. Thewlis, R. C. Glass, D. J. Hughes, A. R. Meetham; Pergamon Press, 1962
Subjects: Physics--Dictionaries
...contact of print and negative is called a printing frame. FRANCIUM. Radioactive element with atomic number 87 and symbol Fr...half period 21 minutes . In the periodic classification Francium constitutes the heaviest member of the alkali group of metals...
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journal articles on: Francium  - 1 result

 
 
1.
Lead Exposure and Cardiovascular Disease-A Systematic Review
Journal article by Ana Navas-Acien, Eliseo Guallar, Ellen K. Silbergeld, Stephen J. Rothenberg; Environmental Health Perspectives, Vol. 115, 2007
Subjects: Cardiovascular diseases--Risk factors, Lead poisoning--Complications and side effects
...Barium OR Berkelium OR Bismuth OR Californium OR Cesium OR Chromium OR Cobalt OR Copper OR Curium OR Einsteinium OR Fermium OR Francium OR Gallium OR Germanium Gold OR Hafnium OR Indium OR Iridium OR Iron OR Lawrencium OR Manganese OR Molybdenum OR Neptunium...


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newspaper articles on: Francium  - 3 results

 
 
1.
AskTheFamily
Newspaper article; Coventry Evening Telegraph (England), June 10, 2006
...A Romania B Bulgaria C Turkey D Hungary QUESTION 12-for 12 points: Which element has the chemical symbol F? A Iron B Francium C Fluorine D Fermium QUESTION 13-for 13 points: With which country did US naval officer Matthew Perry open trade links after...
2.
POST PUZZLER: 50 for Fun; Phil Brown's Trivia Quiz
Newspaper article; Daily Post (Liverpool, England), May 17, 2007
...which country? ANSWERS 1 Tasmania; 2 Sophia Loren; 3 Serbia; 4 Hippocrene; 5 The Andalucia Open; 6 Brazil; 7 In 1912; 8 Francium; 9 The Mississippi (because slaves were even worse-treated near its mouth); 10 Iceland; 11 A (Magellanic) penguin...
3.
50 for Fun
Newspaper article; Daily Post (Liverpool, England), August 17, 2006
Subjects: Pop singers
...Frankincense 34 Hugo Boss 35 Italy 36 The Simpsons 37 A bird (thrush) 38 Fylingdales Moor, Yorkshire 39 Its A Wonderful Life 40 Francium 41 Christopher Marlowe 42 Music Of Black Origin 43 Bramall Lane (Sheffield United) 44 The Indian kingdom of Mysore 45 Albanians...


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encyclopedia articles on: Francium  - 7 results

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1.
Francium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
FRANCIUM fran se m from France , radioactive chemical...sp. gr. unknown; valence +1. Francium is extremely rare; its most stable isotope...minerals. More than 30 other isotopes of francium are known; some are prepared by bombarding...
2.
Periodic Table of the Elements: Francium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
PERIODIC TABLE OF THE ELEMENTS: FRANCIUM Periodic Table of the Elements: Francium Atomic Number: 87 Atomic Symbol: Fr Francium Atomic Weight: (223) Electron Configuration: 2 8 18 32 18 8 1 ____________________ Copyright...
3.
Virginium
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
VIRGINIUM see francium . ____________________ Copyright 2009 Columbia University Press. Used with the permission of Columbia University Press. All rights reserved.
4.
Elements
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...1529. 2863. europium Eu 63 151.96 822. 1597. fermium Fm 100 (257) 1527. fluorine F 9 18.998403 219.62 188.14 francium Fr 87 (223) (27) (est.) (677) (est.) gadolinium Gd 64 157.25 1313. 1 3266. gallium Ga 31 69.72 29.78 2403...
5.
Fr
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
FR symbol for the element francium . ____________________ Copyright 2009 Columbia University Press. Used with the permission of Columbia University Press. All rights reserved.
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