Technetium

Nalin Balan NUCL 200 Paper due 02/07/97 TECHNETIUM atomic Number: 43 nuclear Symbol: Tc Atomic Weight: (97) Electron Configuration: -18-13-2 History, Properties and Uses: (Gr. technetos, artificial) section 43 was predicted on the basis of the periodi c table, and was erroneously reported as having been abide by in 1925, at which time it was named masurium. The factor was actually disc all overed by Perrier and Segre in Italy in 1937. It was found in a sample of molybdenum, which was bombarded by deut erons in the Berkeley cyclotron, and which E. Lawrence sent to these investigators . Technetium was the beginning(a) element to be instigateuced artificially. Since its d iscovery, searches for the element in sublunar material have been made without s uccess. If it does exist, the tautness must(prenominal) be very small. Technetium has been fou nd in the spectrum of S-, M-, and N-type stars, and its resence in stellar matter i s leading to juvenile theories of the prod uction of heavy elements in the stars. Nineteen i sotopes of technetium, with atomic masses ranging from 90 to 108, are known. 97Tc ha s a half life of 2.6 x 10^6 years. 98Tc has a half-life of 4.2 x 10^6 years. The isomer ic isotope 95mTc, with a half-life of 61 days, is useful for tracer work, as it prod uces energetic gamma rays. Technetium metal has been produced in kg quantities. Th e metal was first prepared by passing total heat gas at 1100C over Tc2S7. It is now conveniently prepared by the reduction of ammonium pertechnetate with hydrogen. Techne tium is a silvery-gray metal that tarnishes slowly in moist air. Until 1960, techne tium was operating(a) only in small amounts and the price was as spicy as $2800/g. It is now commercially available to holders of O.R.N.L. permits at... Needs sources. Concise. except Plagiarism is obviously present. Arent you gonna credit people???? hm mm?? OMG!!! U however copied this out fro! m a text book pity discredit SHAME!! If you want to get a enough essay, read it on our website: BestEssayCheap.com

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