| LC control no. | sh 85133086 |
|---|---|
| LC classification | QD181.T35 General and inorganic chemistry QD412.T35 Organometallic chemistry QD464.T35 Atomic and molecular weights QE516.T35 Geochemistry |
| Topical heading | Technetium |
| Variant(s) | Eka-manganese Ekamanganese Masurium Nipponium |
| See also | Manganese group Radioactive substances |
| Found in | Hackh chem. dict. (technetium: masurium, nipponium) Wikipedia, Oct. 31, 2012: Technetium (Technetium is the chemical element with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes; every form of it is radioactive. Many of technetium's properties were predicted by Dmitri Mendeleev before the element was discovered. Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em). In 1937, technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name. Element category: transition metal) WebElements, Oct. 31, 2012 (Technetium; Tc; Element 43 (technetium) was predicted on the basis of the periodic table by Mendeleev. He suggested that it should be very similar to manganese and gave it the name ekamanganese. Technetium was erroneously reported as having been discovered in 1925, at which time it was named masurium. The element was actually discovered by C. Perrier and Emilio Gino Segre in Italy in 1937. It was found in a sample of molybdenum bombarded by deuterons. Technetium was the first element to be produced artificially and all its isotopes are radioactive.) Wiktionary, Oct. 31, 2012 (eka-manganese (chemistry, archaic): technetium; ekamanganese (chemistry): the name given by Dmitri Mendeleev to the predicted element (technetium) lying below manganese in the periodic table) |
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