+ 1-888-787-5890  
   + 1-302-351-4405  
 
 
 
 

Essay/Term paper: Technetium

Essay, term paper, research paper:  Science Research Papers

Free essays available online are good but they will not follow the guidelines of your particular writing assignment. If you need a custom term paper on Science Research Papers: Technetium, you can hire a professional writer here to write you a high quality authentic essay. While free essays can be traced by Turnitin (plagiarism detection program), our custom written essays will pass any plagiarism test. Our writing service will save you time and grade.



Technetium


Nalin Balan
NUCL 200
Paper due 02/07/97

Atomic Number: 43
Atomic Symbol: Tc
Atomic Weight: (97)
Electron Configuration: -18-13-2

History, Properties and Uses:

(Gr. technetos, artificial) Element 43 was predicted on the basis of the
periodi c table, and was erroneously reported as having been discovered in 1925,
at which time it was named masurium. The element 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 first element to be produced artificially. Since its
discovery, searches for the element in terrestrial material have been made
without s uccess. If it does exist, the concentration must be very small.
Technetium has been found in the spectrum of S-, M-, and N-type stars, and its
resence in stellar matter is leading to new theories of the production of heavy
elements in the stars. Nineteen isotopes of technetium, with atomic masses
ranging from 90 to 108, are known. 97Tc has a half-life of 2.6 x 10^6 years.
98Tc has a half-life of 4.2 x 10^6 years. The isomeric isotope 95mTc, with a
half-life of 61 days, is useful for tracer work, as it produces energetic
gamma rays. Technetium metal has been produced in kilogram quantities. The metal
was first prepared by passing hydrogen 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 available only in small amounts and the price was as high
as $2800/g. It is now commercially available to holders of O.R.N.L. permits at a
price of $60/g. The chemistry of technetium is said to be similar to that of
rhenium. Technetium dissolves in nitric acid, aqua regia, and conc. sulfuric
acid, but is not soluble in hydrochloric acid of any strength. The element is a
remarkable corrosion inhibitor for steel.

It is reported aerated distilled water at temperatures up to 250C. This
corrrosion protection is limited to closed systems, since technetium is
radioative and must be confined. 98Tc has a specific activity of 6.2 x 10^8 Bq/g.
Activity of this level must not be allowed to spread. 99Tc is a contamination
hazard and should be handled in a glove box. The metal is an excellent
superconductor at 11K and below.

Source:

CRC Handbook of Chemistry and Physics, 1913-1995. David R. Lide, Editor
in Chief. Author: C.R. Hammond


 

Other sample model essays:

Science Research Papers / Thallium
Thallium My element was Thallium. It is atomic number 81. It has 81 protons and electrons and 123 neutrons. Thallium has a mass of 204.3833 atomic mass units. Its symbol is Tl. I...
Science Research Papers / Alkanes
Alkanes The alkanes are the simplest form of organic compounds. They are made up of only Carbon atoms and Hydrogen atoms. All of the bonds are single and the number of hydrogen atoms...
Science Research Papers / The Atom
The Atom AP Physics Period 2 In the spring of 1897 J.J. Thomson demonstrated that the beam of glowing matter in a cathode-ray tube was not made of light waves, as "the almost unanimous ...
The Classification and Formation of Crystals Introduction Purpose My purpose of this experiment is to find out how crystals are formed and how they are classified. For a long time, I"...
A Portrait of Duke Ellington By Tracy Frech Duke Ellington is considered to be one of the greatest figures in the history of American music. Edward Kennedy "Duke" Ellington was born in Washi...
The Comparative Abundance of The Elements By Derrick Deacon - There are 92 naturally occurring elements, only 17 of them make up 99.5% of the earth's crust (including oceans and atmosphe...
The Effect of Concentrations of Starch and Sugar Solutions on Synthetic Semi- Permeable Membranes By: Jamie Hardy Question: Is dialysis tubing selectively permeable? Hypothesis: If one...
The Element: Chlorine General Information We researched the chemical element known as chlorine. Chlorine has an atomic number of 17 and an atomic weight of 35.453. It has a valence ...
The Fountainhead: Howard Roark and Objectivism In the novel The Fountianhead, Ayn Rand uses the main character, Howard Roark, to express her daringly original philosophy--Objectivism. ...
Science Research Papers / Greenhouse Effect
Greenhouse Effect When one starts a car or burns wood, the last thought on their mind is the consequences to these actions. Unfortunately, the daily dangers to earth are not widely know. Du...
Experience with Dream Essay - Reliable and great customer service. Quality of work - High quality of work.
Browns Mills, New Jersey, United States
Dream Essay - Very reliable and great customer service. Encourage other to try their service. Writer 91463 - Provided a well written Annotated Bibliography with great deal of detail per the rubric.
Browns Mills, New Jersey, United States
it is always perfect
Frederick, Maryland, United States
The experience with Dream Essay is stress free. Service is excellent and forms various forms of communication all help with customer service. Dream Essay is customer oriented. Writer 17663 is absolutely excellent. This writer provides the highest quality of work possible.
Browns Mills, New Jersey, United States
Only competent & proven writers
Original writing — no plagiarism
Our papers are never resold or reused, period
Satisfaction guarantee — free unlimited revisions
Client-friendly money back guarantee
Total confidentiality & privacy
Guaranteed deadlines
Live Chat & 24/7 customer support
All academic and professional subjects
All difficulty levels
12pt Times New Roman font, double spaced, 1 inch margins
The fastest turnaround in the industry
Fully documented research — free bibliography guaranteed
Fax (additional info): 866-332-0244
Fax (additional info): 866-308-7123
Live Chat Support
Need order related assistance?—Click here to submit a inquiry
© Dreamessays.com. All Rights Reserved.
Dreamessays.com is the property of MEDIATECH LTD