CAS Number13494-80-9
PubChem CID6327182
Atomic Radius140
Atomic Volume20.5
Atomic Weight127.6
Boiling Point988
Bulk Modulus
Crystal StructureSimple Trigonal
Covalent Radius138
Electrical Resistivity
Electron Configuration[Kr] 4d10 5s2 5p4
Electrons per shell2, 8, 18, 18, 6
Heat of Fusion17.5
Heat of Vaporization48
Ionization Potential9.01
Magnetic Ordering
Magnetic Susceptibility
Mass Number52
Melting Point449.51
Atomic Number128
Oxidation States-2, 2, 4, 5, 6
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.202
Thermal Conductivity0.024
Van der Waals radius
Young's Modulus
Abundance in Earth's crust9.9×10-8%
Abundance in Universe9×10-7%
Te Tellurium 52 127.6 16 5 p 52 449.5 989.8 [Kr] 5s2 4d10 5p4 2 8 18 18 6 6.24 9.9E-8% Silver Hexagonal 2.1 2.158 {"1":"869.3","2":"1790","3":"2698","4":"3610","5":"5668","6":"6820","7":"13200"} 869 190.2 135 +4,6,-2 1.42 20.5 17.49 50.63 0.202 2.35 0 Solid, Diamagnetic, Semiconductor, Stable, Natural, Metalloid te-LOOR-i-em Silvery-white, brittle simi-metal. Used to improve the machining quality of copper and stainless steel products and to color glass and ceramics. Also in thermoelectric devices. Some is used in the rubber industry and it is a basic ingredient in manufacturing blasting caps. Obtained as a by-product of copper and lead refining. 5ChFbVu4Mpk Tellurium
Louis-Nicolas Vauquelin discovered beryllium in the oxide form in both beryl and emeralds in 1798.

Friedrich Wöhler and Antoine Bussy independently isolated beryllium in 1828 by the chemical reaction of metallic potassium with beryllium chloride.

The first commercially-successful process for producing beryllium was developed in 1932 by Alfred Stock and Hans Goldschmidt. From the Greek word beryllos, beryl 52 1783 Franz Joseph Muller von Reichstein Romania From the Latin word "tellus" meaning "earth"

Isotopes of Beryllium

Standard Atomic Weight


Stable Isotopes

120Te 122Te 123Te 124Te 125Te 126Te 128Te 130Te

Unstable Isotopes

105Te 106Te 107Te 108Te 109Te 110Te 111Te 112Te 113Te 114Te 115Te 116Te 117Te 118Te 119Te 121Te 127Te 129Te 131Te 132Te 133Te 134Te 135Te 136Te 137Te 138Te 139Te 140Te 141Te 142Te

Beryllium and its salts are toxic and should be handled with the greatest of care
Emerald is a naturally occurring compound of beryllium
Beryllium is used in nuclear reactors as a reflector or moderator.

Beryllium metal is used for lightweight structural components in the defense and aerospace industries in high-speed aircraft, guided missiles, space vehicles and satellites.

Unlike most metals, beryllium is virtually transparent to x-rays and hence it is used in radiation windows for x-ray tubes.