Caesium (IUPAC spelling; [9] also spelled cesium in American English) 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 (83.3 °F; 301.6 K), which makes it one of only five elemental metals that are liquid at or near room temperature.

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铯 （ sè ） （英語： Caesium 或 Cesium ；舊譯鏭），是一種化學元素，其化學符號为Cs，原子序數为55，原子量為 132.905 451 96 u 。 铯是淡金色且質地極軟的 碱金属 ， 熔點 低，28.44 ℃时即会熔化。

Mar 8, 2025 · 銫 （ ㄙㄜˋ ） （英語： Caesium 或 Cesium ；舊譯鏭），是一種化學元素，其化學符號為Cs，原子序數為55，原子量為 132.905 451 96 u 。 銫是淡金色且質地極軟的 鹼金屬 ， 熔點 低，28.44 ℃時即會熔化。

Element Caesium (Cs), Group 1, Atomic Number 55, s-block, Mass 132.905. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Jump to main content

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Caesium (or cesium) is the chemical element with the atomic number 55 on the periodic table. Its symbol is Cs. Caesium is an alkali metal. Its melting point is low (28 °C). It is extremely reactive. Because of its high reactivity, it is a dangerous chemical. It may set itself on fire (ignite) in air. It explodes on contact with water.

Jan 31, 2025 · Royal Society of Chemistry - Caesium Energy Education - Cesium Frontiers - Frontiers in Molecular Neuroscience - Cesium activates the neurotransmitter receptor for glycine

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Caesium, also spelt as Cesium, was discovered in 1860. It is outstanding in keeping time with precision, so it is used in atomic clocks. It forms alloys with alkali metals, gold and mercury .