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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
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).
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
Caesium
…point of 28.5 °C (83.3 °F), making it one of the few elemental metals that are liquid near room temperature. The others are rubidium (39 °C [102 °F]), francium (estimated at 27 °C [81 °F]), mercury (−39 °C [−38 °F]), and gallium (30 °C [86 °F]); bromine is also liquid at room temperature (melting at −7.2 °C…
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.