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Name Technetium
Symbol Tc
Atomic number 43
Atomic mass 97 amu
Normal state Solid
Classification Metallic
Crystal structure Hexagonal
Color Silvery-gray
Number of Stable Isotopes 0
Date of discovery 1937
Name of discoverer Carlo Perrier and Emillo G. Segre
Name origin from the Greek tekhnetos, meaning artificial.
Uses Source of radiation for medical research.
Obtained from 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.

Additional Properties

Melting Point: 3915 °F (2157 °C or 2430 K)

Boiling Point: 7709 °F (4265 °C or 4538 K)

Density: 11 grams per cubic centimeter

(Beta) Half-Life: 4.2 million years


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.[1] Before this time, it had been predicted but never found.[2]


The primary use of Technetium is for medical exploration as a tracer. It can also be added to steel for corrosion resistance. This not usually practical, however, since it is a radioactive material.[3]



External Resources