Technetium
Links
Radiochemistry of Technetium
http://lib-www.lanl.gov/cgi-bin/getfile?rc000035.pdf
Full text of the monograph by Edward Anders (Enrico Fermi Institute and Dept. of Chemistry, University of Chicago, Chicago, Illinois). [PDF format]
It's Elemental: Technetium
http://education.jlab.org/itselemental/ele043.html
Basic physical and historical information.
ChemicalElements.com: Technetium
http://www.chemicalelements.com/elements/tc.html
Basic information, atomic structure, and isotopes.
Technetium
http://www.scescape.net/~woods/elements/technetium.html
Data tables and historic information.
Visual Elements: Technetium
http://www.chemsoc.org/viselements/pages/technetium.html
Image, general and physical information, source, uses, key isotopes, and ionisation energies.
EnvironmentalChemistry.com: Technetium
http://environmentalchemistry.com/yogi/periodic/Tc.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Technetium
http://www.webelements.com/webelements/elements/text/Tc/key.html
Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Technetium
http://www.wikipedia.org/wiki/Technetium
Properties of the element, including its history, applications, and charateristics.
Lenntech: Technetium
http://www.lenntech.com/Periodic-chart-elements/Tc-en.htm
Physical data, chemical properties, and health effects.