Cesium
Infrared - Pink - Red - Orange - Tan (Brown) - Yellow - Lime
Green - Aqua (Cyan) - Marine - Blue - Purple - Magenta - Ultraviolet
Radio Waves - Microwaves - Infrared - Optical - Ultraviolet - X-Rays - Gamma Rays
Cosmic Rays
| 55
| Cesium
| Cs
|
| Atomic Weight = 132.90545 (2)
| Electrical Conductivity = 48.9 ´ 103 W-1cm-1
| Melting Point = 301.55 K
|
| Density = 1.87 g/cm3
| Thermal Conductivity = 0.359 W/cm-K
| Boiling Point = 944 K
|
| Molar Volume = 71.07 cm3/mole
|
| Heat of Fusion = 2.092 kJ/mole
|
| Heat of Vaporization = 67.74 kJ/mole
|
| Specific Heat Capacity = 0.24 J/g-K
|
| Isotope Number
| 133
|
| Isotope Fraction
| 1.0
|
HyperPhysics
Cesium is a heavy and extremely reactive alkali metal, for which there are very few applications, beyond High Intensity Discharge (Metal Halide) Lighting.
Experiments in expanded Cesium metal were some of the earliest to explore the concept of the Metal - Insulator Transition.
Alkali metals themselves define the concept of metallic reactivity, by reacting violently with Water, with the evolution of Heat, Light and Hydrogen gas, a property important in Energy Conversion.
Alkali metals are thus generally quite soft and flammable, with increasing reactivity with increasing atomic weight, and, with the usual exception of Lithium, will ignite spontaneously in Air and Water.
Alkali metals, with a valence of +1, react directly with the halides to form ionic salts, which then can undergo Electrolysis at nearly 100% efficiency, and which dissociate back into their respective ions, when in Solution.
Alkali metals form extremely caustic Hydroxides, which can then be neutralized by the halide Acids.
Spherical C60 lattices have very large interstitial voids, which are easily intercalated with alkali metals, forming the metallic and relatively High Temperature Superconductors (Tc ~ 30-50 K), of the strongly correlated, expanded metal variety, which are now usually referred to, as the alkali metal fullerides.
Alkali metals also have the ability to form very remarkable and interesting Atomic Bose - Einstein Condensates (BECs) when cooled at sufficient densities to near absolute zero (nanoKelvin) temperatures.
HyperPhysics
HyperPhysics
Alkali metals also have the unique property of being soluble in Ammonia solutions, which display interesting and dramatic Metal - Insulator Transitions, which offer many, but as yet undeveloped, technological applications, including High Temperature Superconductivity. While alkali metals themselves are not superconducting, expanded and intercalated alkali metals very often do display superconducting properties.
Oxygenated alkali metal Ammonia solutions and Oxygen doped Hydrocarbon polymers are also known to be highly unusual High Current conductors.
Alkali Halide salts also have the unusual property of forming Optically Active Color Centers (f-centers, defects states, etc.), when doped with excess ions or defects.