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"

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.