Technetium • Transition Metal
Primary XPS region: N/A
Overlapping regions: N/A
Binding energies of common chemical states: N/A
- Technetium is a radioactive, artificially-created element.
- It is unlikely to be observed in XPS spectra in a typical laboratory.
Date of discovery: 1937
Name origin: Greek technêtos
Discoverer: Carlo Perrier/Emilio Segre
Obtained from: man-made
Melting point: 2430 K
Boiling point: 4538 K
Molar volume: 8.63 × 10-6 m3/mol
Shell structure: 2,8,18,13,1
Electron configuration: [Kr]4d65s1
Oxidation state: 4,6,7
Crystal structure: body hexagonal
This rare transition metal was discovered by C. Perrier and E. Segre in 1937 in a sample of molybdenum that had been bombarded with deutrons. Since its discovery, many searches for technetium in terrestrial matter have been done. In 1962, 99Tc was isolated as a spontaneous fission product of 238Ur. Technetium is found in the spectrum of S-, M-, and N-type stars, leading to new theories of the production of heavy elements in the stars. Technetium is a silver-gray metal and is the first element to be made artificially. It has 21 isotopes, all of which are radioactive, allowing for its use in medical radioactive isotope tests.