Francium - Fr

Chemical properties of francium

Atomic number	87
Atomic mass	(233) g.mol^-1
Electronegativity according to Pauling	0.7
Density	unknown
Melting point	27 °C
Boiling point	677 °C
Vanderwaals radius	unknown
Ionic radius	unknown
Isotopes	4
Electronic shell	[ Rn ] 7s¹
Energy of first ionisation	375 kJ.mol^-1
Discovered by	Marguerite Perey in 1939

Francium - Fr

Francium

Francium is extremely rare. Because of this its chemical and physical properties are not known. It has been studied by radiochemical techniques, which show that its most stable state is the ion Fr+. Francium is the least electronegative of all the known elements.

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No use has been found for what little francium can be produced.

Francium in the environment

Francium occurs naturally to a very limited extent in uranium minerals. Nevertheless it has been estimated that there might be from 340 to 550 grams of francium in the earth's crust at any one time. Francium is the second rarest element in the crust, after astatine.

Francium - Fr

Chemical properties of francium

Francium

Health effects of francium

Environmental effects of francium

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