http://mams.rmit.edu.au/qtcd0s6zjsrb.jpg
Newton, David E. chemical elements. Farmington hills, MI: uxl, 1999.
"Radiation Poisoning." Wikipedia. 6 Feb. 2008
"Periodic Table." Webelements.com. 6 Feb. 2008
“technecium sound” Webelements.com. 3/11/08