Changes

{{Element | name=Technetium | symbol=Tc | anumber=43 | amass=97 amu | state=Solid | class=Metallic | cstructure=Hexagonal | color=Silvery-gray | date=1937 | discname=Carlo Perrier and Emillo G. Segre | origname=from the Greek ''tekhnetos'', meaning ''artificial''. | uses=Source of radiation for medical research. | obtained=Manufactured by bombarding [[Molybdenum]] with [[heavy hydrogen]] in a [[cyclotron]]. Only minute quantities have been found outside the laboratory, as a by-product of the fission of Uranium-238. }}

{{Element | name=Technetium | symbol=Tc | anumber=43 | amass=97 amu | state=Solid | class=Metallic | cstructure=Hexagonal | stableisotopes=0 | color=Silvery-gray | date=1937 | discname=Carlo Perrier and Emillo G. Segre | origname=from the Greek ''tekhnetos'', meaning ''artificial''. | uses=Source of radiation for medical research. | obtained=Manufactured by bombarding [[Molybdenum]] with [[heavy hydrogen]] in a [[cyclotron]]. Only minute quantities have been found outside the laboratory, as a by-product of the fission of Uranium-238. }}

'''Technetium''' ''(tek-NEE-she-em)'' is a [[radioactive]], silvery-grey synthetic [[metal]].

'''Technetium''' ''(tek-NEE-she-em)'' is a [[radioactive]], silvery-grey synthetic [[metal]].

Density: 11 grams per cubic centimeter

Density: 11 grams per cubic centimeter

   

   

(Gamma) Half-Life: 6.0058 hours<ref>http://education.jlab.org/itselemental/ele043.html</ref>

(Beta) Half-Life: 4.2 million years

 

==History==

==History==

In 1937, the Italian chemists Carlo Perrier and Emilio Segrè isolated Technetium using a cyclotron; it was the first artificially produced (synthetic) element.  Since this element has such a short half-life, it cannot be found in nature.<ref>http://education.jlab.org/itselemental/ele043.html</ref>  Before this time, it had been predicted but never found.<ref>http://www.newworldencyclopedia.org/entry/Technetium</ref>

In 1937, the Italian chemists Carlo Perrier and Emilio Segrè isolated Technetium using a cyclotron; it was the first artificially produced (synthetic) element.  Since this element has such a short half-life, it cannot be found in nature.<ref>http://education.jlab.org/itselemental/ele043.html</ref>  Before this time, it had been predicted but never found.<ref>http://www.newworldencyclopedia.org/entry/Technetium</ref>