How was thorium discovered?

Answer 1

Uranium (as an oxide was discovered by Martin Heinrich Klaproth in 1789 in the mineral pitchblende from Joachimov mine (now in Czech Republic). The pure metal was isolated in 1841 by Eugene-Melchior Peligot.

Answer 2

The discovery of the element is credited to the German chemist Martin Heinrich Klaproth. While he was working in his experimental laboratory in Berlin in 1789, Klaproth was able to precipitate a yellow compound (likely sodium diuranate) by dissolving pitchblende in nitric acid and neutralizing the solution with sodium hydroxide. Klaproth mistakenly assumed the yellow substance was the oxide of a yet-undiscovered element and heated it with charcoal to obtain a black powder, which he thought was the newly discovered metal itself (in fact, that powder was an oxide of uranium). He named the newly discovered element after the planet Uranus, which had been discovered eight years earlier by William Herschel. In 1841, Eugène-Melchior Péligot, who was Professor of Analytical Chemistry at the Conservatoire National des Arts et Métiers (Central School of Arts and Manufactures) in Paris, isolated the first sample of uranium metal by heating uranium tetrachloride with potassium.Uranium was not seen as being particularly dangerous during much of the 19th century, leading to the development of various uses for the element. One such use for the oxide was the aforementioned but no longer secret coloring of pottery and glass.

Answer 3

Uranium was discovered (in the form of an oxide) in 1789 by the Germam chemist Martin Heinrich Klaproth.

In 1841 the French chemist Eugene Melchior Peligot obtained uranium as a pure metal for the first time.

Answer 4

Uranium was discovered in Africa after three english hunters came back to a tribe where a man had been mouled by a tiger. When they asked about the mans condition, they were sent to a place where they only seen a head of the man. He was buried to his chin in dark black dirt. The english men pulled him out and to there surpise the man had been cured of all cuts. They inquired about the earth he was buried in and took samples back to Europe. K.Z

Answer 5

Martin Heinrich Klaproth obtained the oxide of uranium - U3O8 in 1789; but the pure element was obtained in 1841 by Eugene-Melchior Peligot.

Answer 6

Discovered as an oxide by Martin Klaproth in 1789, first separated as a pure metal by Eugene Melchior Peligot in 1841.

Answer 7

Thorium was discovered by Jöns Jakob Berzelius during studies in the period 1815-1828, analyzing some minerals from Sweden and Norway. The announcement of the discovery was in 1829.

Answer 8

Uranium was disvovered (as an oxide) in 1789 in Germany by Martin Heinrich Klaproth; but the mineral pitchblende was from Jachimow, now in Czech Republic.

Answer 9

Uranium was discovered as an oxide in 1789 by Martin Heinrich Klaproth after the study of a new mineral from Joachimov; in 1841 Eugene Peligot obtained uranium as a pure metal.