Work Cited

Brown, Theodore. Chemistry: The Central Science. 1st. Chicago IL: Chicago Ink, 2001.
Chemistry. 1st. Chicago: Hawly Publishing, 2006.
Daintith, John. "Radium."Oxford Dictionary of Chemistry. 3. 1999
Edward L. Waterman , Michael S. Matta, Dennis D. Staley,, and Antony C. Wilbraham, . Prentice Hall
Hunt, Andrew. "Strontium Properties."Shaum's A-Z Chemistry. 1st. 2005.
Janice, Smith. "Calcium." Web Elements 26 Nov 2008 .
Strauss, Richard. "Chemical Properties of Calcium."Hawley's Condensed Chemical Dictionary. 2nd. 2006Taylor,Rittens. "Calcium." Web Elements 12/15/2003 24 Nov 2008 .