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Francium
Indeterminiate because this element is relatively short lived and exists only as a transient decay product.
Marguerite Perey is credited with the discovery of francium in 1939.
Further Details:
This WebElements periodic table page contains Essential information for the element francium ... Brief description: francium occurs as a result of α disintegration of actinium. Francium is found in uranium minerals, and can be made artificially by bombarding thorium with protons. It is the most unstable of the first...
www.webelements.com/francium/ www.webelements.com/francium/ · Cached
This WebElements periodic table page contains historical information for the element francium ... Francium was discovered by Marguerite Perey at 1939 in France. Origin of name: named after "France"
www.webelements.com/francium/history.html www.webelements.com/francium/history.html · Cached
I currently do not know of any links for Francium. If you do, please let me know; ... Francium at Chemical Elements.com ... [Bohr Model of Francium]
www.chemicalelements.com/elements/fr.html · Cached
The Element Francium - Basic Physical and Historical Information ... The Element Francium; [Click for Isotope Data] ... Francium was discovered by Marguerite Catherine Perey, a French chemist, in 1939 while analyzing actinium's decay sequence. Although considered a natural element, scientists estimate that there is no more than...
education.jlab.org/itselemental/ele087.html · Cached
Francium - Wikipedia, the free encyclopedia
Francium (pronounced /ˈfrænsiəm/ , FRAN -see-əm ), formerly known as eka-caesium and actinium K , is a chemical element that has the symbol Fr and atomic number 87. It has one of...
en.wikipedia.org/wiki/Francium
Basic information and history. ... Because all known isotopes of francium are highly unstable, knowledge of the chemical properties of this element comes from radiochemical techniques. No weighable quantity of the element has been prepared or isolated.
periodic.lanl.gov/elements/87.html · Cached
Comprehensive information for the element Francium - Fr is provided by this page including scores of properties, element names in many languages, most known nuclides and technical terms are linked to their definitions. ... Element Francium - Fr...
environmentalchemistry.com/yogi/periodic/Fr.html
Information about Francium - general properties, discovery, states, energies, appearance and characteristics. ... Discovered: Francium was discovered by Marguerite Perey in 1939 when examining the radioactive decay of 227actinium. Francium, which was named after France, completed humankind's discoveries of naturally...
www.chemicool.com/elements/francium.html www.chemicool.com/elements/francium.html
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