Metals, ancient, 5 Swedish

Swedish chemist Jons Jakob Berzelius Radioactive metal named for Thor, the ancient Scandinavian god of war promising as a future source of nuclear energy makes magnesium alloys heat resistant. 

Thulium is a silver-grey metal with a bright luster. Swedish chemist Per Theodor Cleve discovered the metal in 1879 while processing the ore er-bia. One of the materials Cleve extracted from the ore was a green substance he named thulia —a thulium oxide. The element s name is derived from an ancient name for northern Europe, Thule. 

Tungsten is a metallic transition element in Period 6, Group 6 of the Periodic Table. It was first described in 1783 by Spanish brothers Juan Jose and Fausto de Elhuyar. They named the element Wolfram after a term used by the ancient tin miners in Saxony-Bohemia, describing a still unknown mineral. The name was later changed to tungsten, derived from the Swedish words tung and sten (meaning heavy stone ). 

The first of the rare earths, yttrium, was discovered just before the beginning of the Nineteenth Century (1794) in a rare Swedish ore, and separated in the form of an impure oxide. At that time, the more active metals such as magnesium, calcium, aluminum and barium had been isolated only in their oxide form. These oxides were believed to be elements and were referred to as common earths . The ancient Greeks taught that all matter was made up of... 

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