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Periodic Table
Elemental Facts:
  
Symbol
 Fr
Atomic Number
 87
Atomic Mass
 223 
Electron Configuration
2.8.18.32.18.8.1 
[Rn].7s1
Valence Number 1
Oxidation Numbers +1
Melting Point 300°K, 27°C, 81°F
Boiling Point  950°K, 677°C, 1251°F 
Family
 1
Series
 7
Element Classification
 Alkali Metal, (Radioactive)
Density
 No Data
Crystal Structure Cubic body centered
State of Matter
 Solid
Date/Place of Discovery
 1939, France
Person Who Discovered Marguerite Derey
Historical Facts and Elements Uses:
Francium  «FRAN see uhm», is a radioactive element produced in certain nuclear reactions.  It is the heaviest member of the group of elements called the alkali metals.  The group also includes lithium, sodium, potassium, rubidium, and cesium.  Like the other alkali metals, francium takes the form of singly charged positive ions in its compounds.  Its chemical properties
closely resemble those of cesium. See Alkali; Cesium.  Francium has an atomic number of 87, and its chemical symbol is Fr. The most stable isotope of francium has an atomic mass number (total number of protons and neutrons) of 223.  This isotope has a half-life of 22 minutes—that is, due to radioactive decay, only half the atoms in a sample of isotope 223 would still be atoms of that isotope after 22 minutes.  The French scientist Marguerite Perey discovered francium in 1939 as a product of the radioactive decay of actinium.  It was formerly known as virginium. 

 
Bibliography:
http://www.environmentalchemistry.com/yogi/periodic/Fr.html, 18-01-02

http://www.webelements.com/webelements/scholar/elements/francium/key.html, 18-01-02

Bentor, Yinon. Chemical Element.com - Francium. Jan. 18, 2002:  <http://www.chemicalelements.com/elements/fr.html>.

http://www.worldbookonline.com/wbol/wbPage/na/ar/co/208920?op1=&st1=Francium&op2=&st2=&op3=&st3=,                              18-01-02

 
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Created By:
 MAL
Last Updated:
 18-01-02