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francium

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francium

Radioactive metallic element, atomic number 87, relative atomic mass 223. It is one of the alkali metals and occurs in nature in small amounts as a decay product of actinium. Its longest-lived isotope has a half-life of only 21 minutes. Francium was discovered and named in 1939 by Marguérite Perey, to honour her country.



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? Mentioned in ? References in periodicals archive
 
At number 87 in the periodic table, francium is the least stable of the first 103 elements.
Creating, cooling, trapping francium atoms by Peterson, Ivars / Science News
A Cerium (Ce) B Sulfur (S) C Zirconium (Zr) D Francium (Fr) B.
It's your choice by Science World
To study subtle nuclear effects, the researchers hope to use the same method to trap francium atoms, which exist only as short-lived, intensely radioactive isotopes.
Cold traps for 'hot' atoms by Peterson, Ivars / Science News
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