Name Technetium
Symbol Tc
Atomic Number 43
Atomic Mass 98.0 atomic mass units
Number of Protons 43
Number of Neutrons 55
Number of Electrons 43
Melting Point 2200.0 C
Boiling Point 4877.0 C
Density 11.5 grams per cubic centimeter
Normal Phase Solid
Family Transition Metals
Period 5
Cost $60 per gram



Origin of Name From the Greek word technetos, meaning artificial
Date and Place of Discovery In 1937 in Italy
Discovered by Carlo Perrier and Emilio Segre
Common Compounds
  • Technetium fluoride (TcF6)
  • Technetium sulphide (TcS2)
Interesting facts
  • It was one of the elements that was predicted before it was discovered based upon the pattern discovered by Mendeleev.
  • It was original named masurium.
  • When discovered in 1937 it was found in a sample of molybdenum.
  • It was the first element to be produced artificially.
  • It is a radioactive metal which must be kept in closed systems.
  • It is unstable.
  • It is not normally found in the human body.
Common Uses
  • Radioactive tracing in medicine
  • Nuclear medicine
  • Corrosion inhibitor
  • Superconductor


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Chemical Elements
Principal Metals

Technetium Atomic Structure Elements by Name Elements by Number Home