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Caesium - Wikipedia, the free encyclopedia
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日期：2026-04-21
Caesium or cesium[note 1] is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are liquid at or near room temperatur...看更多
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