Bibliography+reid

These are the web sites I used while working on my project. Hope you look at them!

http://www.lenntech.com/Periodic-chart-elements/Ca-en.htm http://www.chem4kids.com/files/elements/020_speak.html http://environmentalchemistry.com/yogi/periodic/Ca.html#Overview [|http://www.bbc.co.uk/history/historic_figures/davy_humphrey.shtml http://www.webelements.com/webelements/scholar/elements/calcium/key.html]