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Francium
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Francium is a chemical element; it has symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223, has a half-life of only 22 minutes. It is the second-most ele
This sample of uraninite contains about 100,000 atoms (3.7×10−17 g) of francium-223 at any given time.
This sample of uraninite contains about 100,000 atoms (3.7×10−17 g) of francium-223 at any given time.
Caesium
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Caesium is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that a
Francium
…K after the natural decay chain in which it appears), has a half-life of only 22 minutes. It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Francium's isotopes decay quickly into astatine, radium, and radon. The electronic…
Cesium
Cesium
High-purity caesium stored in argon
High-purity caesium stored in argon
Caesium crystals (golden) compared to rubidium crystals (silvery)
Caesium crystals (golden) compared to rubidium crystals (silvery)
Monatomic caesium halide wires grown inside double-wall carbon nanotubes (TEM image).
Monatomic caesium halide wires grown inside double-wall carbon nanotubes (TEM image).