Intense reaction with water or acids releases H2 for combustion. Chemical and Physical Properties of Caesium The symbol in the periodic table of elements: (Cs) Atomic number: 55 Atomic weight (mass): 132.9054 g.mol-1 Group number: 1 (Alkali metals) Period: 6 Color: Silvery-golden alkali metal Physical state: Liquid at or near room temperature Half-life: From 500(100) s to 2. In contact with air, there is a fire, and an explosive reaction occurs when organic matter is mixed. The properties of cesium are similar to potassium, but more reactive than potassium (the most active of the alkali metals). Caesium also has the highest electropositivity of all known elements and fluorine has the highest electronegativity of all known elements. Caesium fluoride can be used in organic synthesis as a source of the fluoride anion. It is second only to Mercury as a fusible metal. Caesium fluoride or cesium fluoride is an inorganic compound with the formula CsF and it is a hygroscopic white salt. Reaction with water to release H2, soluble in liquid ammonia. Thermal conductivity: 35.9W/(m? K), at the melting point of the liquid is 18.4w/(m? K), at the boiling point of the vapor is 0.0046w/(m? K). It can also be formed by the thermal decomposition of caesium superoxide: 3 2CsO 2 Cs 2 O 2 + O 2. It can be formed from caesium metal by adding a stoichiometric amount in ammonia solution, or oxidizing the solid metal directly. Caesium cyanide has chemical properties similar to potassium cyanide and is very toxic. Caesium peroxide or cesium peroxide is a compound of caesium and oxygen. Heat of fusion: 2.087kJ/mol Heat of vaporization: 68.85 kJ/mol. and with crystals similar in appearance to sugar. Specific heat capacity (20 degrees C) 0.217 J/(g? K). Rapid oxidation in humid air, can spontaneous ignition. Caesium is one of four elements who exist in liquid form at or near room temperature. Caesium properties, discovery, usage, isotopes, methods of production, applications, interesting facts, FAQs, Thermal, physical, chemical and magnetic properties. Incompatible with chlorine, phosphorus, water.Ī silver-white ductile metal. Physical Characteristics Caesium is a silvery-gold metallic element. Reacts with H2O to evolve H2 soluble liquid NH3 ĪCGIH: TWA 2 ppm STEL 4 ppmOSHA: TWA 2 ppm(5 mg/m3)NIOSH: IDLH 25 ppm TWA 2 ppm(5 mg/m3) STEL 4 ppm(10 mg/m3)įlammable solid highly flammable in powder form. General Properties: Relative atomic mass: 132.905 1 Atomic mass/weight: 132.905 atomic mass units 4 Mass number: 133 13 Molar mass : 132.90545190 ± 0.
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