Rubidium
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Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. Rubidium is the first alkali m
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Partially molten rubidium metal in an ampoule
Rubidium crystals (silvery) compared to caesium crystals (golden)
Flame test for rubidium
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
Rubidium
…a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. Rubidium is the first alkali metal in the group to have a density higher than water. On Earth, natural rubidium comprises two isotopes: 72% is a stable…
Cesium
High-purity caesium stored in argon
Monatomic caesium halide wires grown inside double-wall carbon nanotubes (TEM image).