The low melting point metal cesium is a golden, active metal, belongs to the rare metal. Can easily oxidized in the air, and the intense reaction to generate hydrogen gas and water explosion. Cesium in nature no elemental form, the distribution of cesium in the form of salt rarely in land and sea. Cesium is also important materials to make vacuum apparatus, photocell, etc. Radionuclide Cs - 137 is Japan's fukushima daiichi nuclear plant one of the leaked radioactive pollution.
Cesium in 6 cycles of alkali metal (IA), is a golden alkali metal, very soft (it mohs hardness is the lowest of all elements), and ductility. There is no radioactive cesium metal, but metal cesium belong to dangerous chemicals, belongs to the wet and spontaneous combustion inflammable. Should be careful while using it.
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