Technetium
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Technetium is a chemical element, having the chemical symbol Tc. Its atomic number (the number of protons) is 43. It has a standard atomic weight of 98 g•mol −1 and is a solid in its elemental form.
Technetium is considered to be a member of the "Transition metal" class of elements.[1] At a pressure of 101.325 kPa, it has a boiling point of 4,265 °C and a melting point of 2,157 °C.
All the isotopes of technetium are radioactive; 98 is the atomic mass of technetium's longest-lived isotope—technetium is the lightest chemical element lacking a stable isotope. Only very small amounts of technetium are found in nature. Practically all technetium is produced synthetically as a by-product of the fission of uranium-235 in nuclear reactors and it is extracted from the spent reactor fuel rods.[2]
References
- ↑ Note: Technitium is also sometimes referred to being a member of a Synthetic or Quasi-synthetic class of elements.
- ↑ John Elmsley (2001). Nature's Building Blocks: An A-Z Guide to the Elements, 1st Edition. Oxford University Press. ISBN 0-19-850341-5.