Reference.

http://encarta.msn.com/encyclopedia_761564552/Zinc.html#s2
http://encarta.msn.com/encnet/refpages/SRPage.aspx?search=calcium
http://encarta.msn.com/encnet/refpages/SRPage.aspx?search=magnesium
http://encarta.msn.com/encyclopedia_761575249/Aluminium.html#p1
http://encarta.msn.com/encyclopedia_761567901/Iron.html
http://encarta.msn.com/encyclopedia_761558727/Lead.html
http://encarta.msn.com/encnet/refpages/SRPage.aspx?search=copper&Submit2=Go
http://encarta.msn.com/encyclopedia_761556180/Mercury_(element).html
http://encarta.msn.com/encyclopedia_761579307/Silver.html
http://encarta.msn.com/encyclopedia_761570498/Gold.html
http://en.wikipedia.org/wiki/Zinc
http://ecat.microweb.com.hk/cgi-bin/alloymetal/final_01/products.htm
http://www.hopshingfty.com.hk/hopshing/index2.html
http://www.thboats.com/pages/advmetal.html