Bazsites.com Francium

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Wikipedia: Francium - Properties of the element, including its history and characteristics.
Visual Elements: Francium - Image, general and physical information, and key isotopes.
Francium - Isotopes, natural occurrence, separation, analytical properties, applications, and bibliography.
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.
ChemGlobe: Francium - Electronic, thermal, and steric data along with an isotope table.
LANL: Francium - Basic information and history.
Lenntech: Francium - Physical data and chemical properties.
WebElements: Francium - Extensive information on history and properties.
EnvironmentalChemistry.com: Francium - Atomic structure, chemical and physical properties, and table of nuclides.

Isotopes of francium - Francium (Fr) has no stable isotopes. A standard atomic mass cannot be given.
Francium - Francium (IPA: ), formerly known as eka-caesium and actinium K,Actually the least unstable isotope, Fr-223 is a chemical element that has the symbol Fr and atomic number 87. It has the lowest known electronegativity and is the second rarest naturally occurring element (after Astatine).
Isotopes of caesium - Caesium (Cs) has at least 39 known isotopes, which is more than any other element except francium. The atomic masses of these isotopes range from 112 to 151.
Marguerite Perey - Marguerite Catherine Perey (October 19, 1909 – May 13, 1975) was a French physicist. In 1939, Perey discovered the element francium, by purifying samples of lanthanum that contained actinium.
Caesium - ... that has the symbol Cs and atomic number 55. It is a soft silvery-gold alkali metal with a melting point of 28 °C (83 °F) which makes it one of the metals that are liquid at or near room temperature along with rubidium (39°C), francium (27 °C), mercury (-39 °C), and gallium (30 °C).