ChemGlobe: Technetium
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/43.html

LANL: Technetium
- History, isotopes, properties, and handling.
- http://periodic.lanl.gov/elements/43.html

Wikipedia: Technetium
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Technetium

Lenntech: Technetium
- Physical data, chemical properties, and health effects.
- http://www.lenntech.com/Periodic-chart-elements/Tc-en.htm

EnvironmentalChemistry.com: Technetium
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Tc.html

Visual Elements: Technetium
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/technetium.html

ChemicalElements.com: Technetium
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/tc.html

It's Elemental: Technetium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele043.html

Radiochemistry of Technetium
- Full text of the monograph by Edward Anders (Enrico Fermi Institute and Dept. of Chemistry, University of Chicago, Chicago, Illinois). [PDF format]
- http://lib-www.lanl.gov/cgi-bin/getfile?rc000035.pdf

Britannica Nobel Prize: Technetium
- Overview and basic data.
- http://www.britannica.com/nobel/micro/584_98.html