Rn Radon 86 (222) 18 6 p 86 -71.0 -61.8 [Xe] 4f14 5d10 6s2 6p6 2 8 18 32 18 8 0.00973 N/A Colorless Cubic: Face centered 2.60 {"1":"1037"} 1042 0 140 0 1.34 50.5 2.9 16.4 0.094 0.00364 1 3.823495 d 5.516088d AlphaEmission Gas, NobleGas, Nonmetal, Radioactive, Natural RAY-don Colorless, odorless, tasteless, radioactive, heavy, noble gas. Used to treat some forms of cancer. Formed from the decay of radium in the earths crust. OMCVgvHG7-c Radon

Ytterbium was discovered by the Swiss chemist Jean Charles Galissard de Marignac in the year 1878.

In 1907, in Paris, George Urbain separated ytterbia into two constituents.

Ytterbium metal was first made in 1937 by Klemm and Bonner by heating ytterbium chloride and potassium together.

A relatively pure sample of the metal was obtained only in 1953. Ytterbium was named after Ytterby, a town in Sweden 86 1900 Friedrich Ernst Dorn Germany Named after "the element radium" (radon was called niton at first, from the Latin word "nitens" meaning "shining"

Ytterbium is considered to be moderately toxic

Ytterbium is recovered commercially from monazite sand

Ytterbium fiber laser amplifiers are used in marking and engraving.

Ytterbium compounds are also used as catalysts in the organic chemical industry.

Ytterbium can be used as a dopant to help improve the grain refinement, strength, and other mechanical properties of stainless steel.