Technetium

Nalin Balan NUCL 200 Paper due 02/07/97 TECHNETIUM Atomic Number: 43 Atomic token: Tc Atomic Weight: (97) Electron Configuration: -18-13-2 History, Properties and Uses: (Gr. technetos, artificial) portion 43 was predicted on the rear end of the periodi c table, and was erroneously reported as having been notice in 1925, at which time it was named masurium. The factor was actually discovered 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 basic ingredient to be produced artificially. Since its d iscoin truth, searches for the element in terrestrial material have been made without s uccess. If it does exist, the compactness must 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 star(p) to new theories of the production of heavy elements in the stars. Nineteen i sotopes of technetium, with atomic peck 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 admixture has been produced in kilogram quantities. Th e metal was set-back prepared by notch total heat bollix up 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 functional only in small amounts and the price was as high as $2800/g. It is now commercially easy to holders of O.R.N.L. permits at... Needs sources. Concise. BUT Plagiarism is apparently present. Arent you gonna credit people???? hmmm?? OMG!!! U just copied this out from a text book commiseration SHAME SHAME!! If you fate to get a bountiful essay, order it on our website: Orderessay

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