Atomic NumberAtomic Number of Caesium
Atomic Number of Caesium is 55.
Chemical symbol for Caesium is Cs. Number of protons in Caesium is 55. Atomic weight of Caesium is 132.905452 u or g/mol. Melting point of Caesium is 28,4 °C and its the boiling point is 690 °C.
» Boiling Point » Melting Point » Abundant » State at STP » Discovery YearAbout Caesium
Caesium is a soft metal of yellowish color, which is very highly reactive and can explode in water. The name of this chemical element is derived from a Latin word meaning blue flames which can be seen when this element burns. This element can be found in minerals and is stored in oil as it is very highly reactive. Caesium has no biological importance and in its pure form is not toxic or poisonous. The most common use of this element is producing so called Caesium clock, which is an atomic clock with extremely high precision. Such clocks are used for GPR connections and mobile networks. Other applications of caesium and its compounds include optical glass producing, producing drilling fluids, as well as being used as a catalyst in chemical industry.
Uses of Caesium
Caesium (Cs), also known as Cesium, is used in photoelectric cells, vacuum tubes, scintillation counters, spectrophotometers, atomic clocks (caesium clocks), and photomultiplier tubes. It can be also used in thermionic power converters. In addition, Caesium is employed as an industrial gamma-ray source. Caesium carbonate, a compound with the formula Cs2CO3, is used in organic synthesis as well as in energy conversion. Caesium oxide, consists of caesium and oxygen, is exploited in devices like vacuum photodiodes and TV camera tubes. Caesium sulfate, another compound with the formula Cs2SO4, is employed for preparing dense aqueous solutions for use in isopycnic centrifugation.
Compounds with Caesium
- Cs2O2: Cesium Peroxide
- CsBr: Cesium bromide
- CsHCO3: Cesium bicarbonate
- Cs2CO3: Cesium carbonate
- CsOH: Cesium hydroxide
- CsI: Cesium iodide
- CsO2: Cesium superoxide
- Cs2O: Cesium oxide
- CsOH: Cesium hydroxide
- CsN3: Cesium azide
- Cs2SO4: Cesium sulfate
Properties of Caesium Element
| Atomic Number (Z) | 55 |
|---|---|
| Atomic Symbol | Cs |
| Group | 1 |
| Period | 6 |
| Atomic Weight | 132.905452 u |
| Density | 1.873 g/cm3 |
| Melting Point (K) | 301.59 K |
| Melting Point (℃) | 28,4 °C |
| Boiling Point (K) | 944 K |
| Boiling Point (℃) | 690 °C |
| Heat Capacity | 0.242 J/g · K |
| Abundance | 3 mg/kg |
| State at STP | Solid |
| Occurrence | Primordial |
| Description | Alkali metal |
| Electronegativity (Pauling) χ | 0.79 |
| Ionization Energy (eV) | 3.8939 |
| Atomic Radius | 260pm |
| Covalent Radius | 225pm |
| Valence Electrons | 1 |
| Year of Discovery | 1860 |
| Discoverer | Kirchhoff and Bunsen |