Radium
Query URLs
https://term.museum-digital.de/md-de/tag/40976
- Note
- Radium is a chemical element with the symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra3N2). All isotopes of radium are radioactive, the most stable isotope being radium-226 with a half-life of 1,600 years. When radium decays, it emits ionizing radiation as a by-product, which can excite fluorescent chemicals and cause radioluminescence.
Radium, in the form of radium chloride, was discovered by Marie and Pierre Curie in 1898 from ore mined at Jáchymov. They extracted the radium compound from uraninite and published the discovery at the French Academy of Sciences five days later. Radium was isolated in its metallic state by Marie Curie and André-Louis Debierne through the electrolysis of radium chloride in 1911.
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Damenbadehaube aus Kunststoff
Die Haube besteht aus zwei...
Object information
Image: Heimatmuseum und -Archiv Bad Bodendorf - CC BY-NC-SA -
Stand der "Uran-Radium-Gesellschaft Berlin"
Anfang Juli 1927 fand die...
Object information
Image: Stadtmuseum Cottbus - CC BY-NC-SA -
Radium Transportbehälter
Radium Transportbehälter, mit...
Object information
Image: Krankenhausmuseum Bielefeld e.V. - CC BY-NC-SA
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