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The radioactive device - Uranium has been unclosed in 1789 German chemist Martin Henry Klaprotom at mineral examination «pitchblende». Uranium unclosed by English astronomer William Gershel in 1781 is termed by it in honour of the planet. In a metal state uranium has been gained in 1841 by the French chemist Ezhenom Melkorom Peligo at restoration UCl4 by metal kalium. Radioactive properties of uranium were found out in 1896 by the French physicist Antoine Anri Bekkerel.
Initiatingly to uranium assigned nuclear mass 116, but in 1871 the Russian[ru] chemist Dmitry Ivanovich Mendeleyev has come to conclusion, that it should be doubled. After opening of devices with nuclear numbers from 90 to 103 American[ru] physics and chemist Glenn Teodor Siborg has come to conclusion, that these devices (actinoids) to have in periodic system in one crate with a device № 89 actinium more correctly. Such arrangement is related by that actinoids have a completion 5 f-elektoronnogo a subtotal.
In 1789 the German chemist, the foreign honorary member Petersburg АН Martin-Henry Klaprot (1743-1817) has unclosed uranium, wrongly having accepted for pure metal dioxide uranium. Uranium is termed in honour of a planet.
In 1841 the French chemist Ezhen Peligo (1811-1890) has gained for the first time uranium in Metal state.
In 1896 the son of physicist Alexander Edmona Bekkerelja, French physicist Antoine Anri Bekkerel has unclosed the phenomenon of a radio-activity of uranium.
In 1934 the French researchers Iren and Frederik Zholio-Kjuri have unclosed the phenomenon Artificial radio-activity.
In 1935 the American physicist and chemist Arthur Dzhefri Dempster (1886-1950) has unclosed Uranium isotopes: 234, 235 and 238.
In 1939 German physicists Otto Hannahs and Liza Mejtner have made the first experiments With artificial division of kerns of uranium.
In 1939 Frederik Zholio-Kjuri has gained effect of a chain reaction at action Neutrons on an isotope 235U.
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