what is the Cesium?
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Caesium
Caesium is a chemical element with the symbol Cs and atomic number 55.
It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature.
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cesium is radioactive and most electro positive metal present in 7 period 1 group
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