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Technetium, radioactive metallic element, the first element to be created artificially. Technetium is one of the transition elements of the periodic table. In 1937 Emilio Segrč and Carlo Perrier created technetium by bombarding molybdenum targets with deuterons (particles consisting of a proton and a neutron). Because technetium is not part of the decay series of any naturally radioactive element, scientists had thought that technetium does not occur in nature. In 1988, however, minute quantities of it were detected in ore from a deep molybdenum mine in Colorado. Isotopes ranging in mass number from 90 to 111 are known; the most common isotope has a mass number of 99. Technetium forms oxides, sulphides, and technetiates, such as ammonium technetiate (NH4TcO4). Compounds and alloys containing technetium oxide can prevent the corrosion of iron by water. Technetium-99 is used for imaging in medicine. Technetium melts at about 2200° C, boils at about 4570° C , and has a relative density of 11.5.
On April 24, 2008, a group led by Amnon Marinov at the Hebrew University of Jerusalem claimed to have found single atoms of unbibium in naturally occurring thorium deposits at an abundance of between 10-11 and 10-12, relative to thorium..
un bi bi, of course, coming from the Latin for 1 2 2 [^]