Mineral Species containing Francium (Fr)

**Francium (Fr) Element Properties**
Atomic Mass	223
Atomic Number	87
Name Origins	Named after France
Year Discovered	1939
Discovery Credits	Discovered by Marguerite Perey in Paris, France.
Remarks	Intensely radioactive, short lived metal element. Primarily occurs as a trace amount (a few ppm) in uranium or thorium minerals where it is a decay product of uranium and/or thorium.
References	Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.
See Also	WebElements, ChemiCool

Atomic Mass

223

Atomic Number

87

Name Origins

Named after France

Year Discovered

1939

Discovery Credits

Discovered by Marguerite Perey in Paris, France.

Remarks

Intensely radioactive, short lived metal element. Primarily occurs as a trace amount (a few ppm) in uranium or thorium minerals where it is a decay product of uranium and/or thorium.

References

Emsley, J., 1991; THE ELEMENTS : Sec. Ed., Clarendon Press, Oxford, 251 p.

Symbol	Isotope Mass	Isotope Nuclide Number	Isotope Number	Natural Abundance	Half-life	Half-life Units	Decay Mode	Decay Mode MeV	Decay Mode %
Fr	211.99613	212	87	Trace	20	min.	EC alpha	5.07 6.529	57.0% 43.0%
Fr	223.019733	223	87	Trace	21.8	min.	beta -	1.147	100.0%

There are no minerals containing Francium (Fr)