Barium
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Barium is a chemical element; it has symbol Ba and atomic number 56. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Because of its high chemical reactivity, barium is
Barium unter Argon Schutzgas Atmosphäre
Oxidized barium
Portrait of Sir Humphry Davy by Thomas Lawrence, 1821. Sir Humphry Davy was the first to isolate barium metal.
Benitoite crystals on natrolite. The mineral is named for the San Benito River in San Benito County where it was first found.
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
Barium
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Cesium
High-purity caesium stored in argon
Caesium crystals (golden) compared to rubidium crystals (silvery)
Monatomic caesium halide wires grown inside double-wall carbon nanotubes (TEM image).