While there is no exact date, it has been a known mineral since at least the 15th century.
Polonium was discovered by Marie Curie and her husband, Pierre Curie, in 1898. They isolated it from pitchblende ore.
In pitchblende from Joachimow (now in Czech Republic), 1789
Radium was more or less discovered by accident while the Curies were looking for Uranium in samples of Pitchblende. In 1898, they discovered in tiny amounts, Polonium in July, and Radium in December.
pitchblende was the first, but any good uranium ore will do as it is a daughter element of uranium's decay.
In Paris, France, in 1898. The announcement was made on December 26, 1898. It was isolated from the residues of the uranium ore pitchblende by Marie and Pierre Curie and Gustave Bémont. Pierre died in 1906, and Marie Sklodowska Curie (1867-1934) received the Nobel prize for Chemistry in 1911.
Radium was first discovered in an ore called pitchblende
The Curie couple brought the source (pitchblende) from North Bohemia
Uranium was discovered (as an oxide, in pitchblende) by Martin Heinrich Klaproth in 1789.
Polonium was discovered by Marie Curie and her husband, Pierre Curie, in 1898. They isolated it from pitchblende ore.
Pitchblende, a radioactive mineral, was first discovered by Johann Gottfried Gahn and K. A. Hauy in 1789. It was later identified as a uranium-rich mineral by Martin Heinrich Klaproth in 1789.
In pitchblende from Joachimow (now in Czech Republic), 1789
Radium was more or less discovered by accident while the Curies were looking for Uranium in samples of Pitchblende. In 1898, they discovered in tiny amounts, Polonium in July, and Radium in December.
1789: Martin Klaproth discovered a mineral of uranium (pitchblende, uranium dioxide) at Jachimow, now in Czech Republic 1841: Eugene Melchior Peligot obtained uranium as a pure element
The color of pitchblende makes it easy to find it.
Radium was discovered by the Curies in France in 1898, in samples of pitchblende which were found to be radioactive after removal of the uranium.
Uranium was discovered as an oxide in 1789 by the German chemist Martin Heinrich Klaproth in a mineral (probable pitchblende) from Joachimov (now in Czech Republic); the pure metal was obtained in 1841 by Eugene Peligot in France.
Uranium was discovered in 1789 by German chemist Martin Klaproth, who extracted it from the mineral pitchblende. Klaproth named the new element after the planet Uranus, which had been discovered just a few years earlier.