citations+livio

__ Credits __  livio dinaj ==__Oxygen ____ (O) - Chemical properties, Health and Environmental effects. __ 1 February 2008  < www.lenntech.com/Periodic-chart-elements/O-en.htm>. ==


__ The element of oxygen. __ 1 February 2008. < education.jlab.org/its**element**al/ele008.html>. __ Oxygen. __ 1 February 2008. . “Oxygen” __Encyclopedia Brittanica.__ 2003. __ The element of oxygen. __ 1 February 2008. < education.jlab.org/its**element**al/ele008.html> __ Oxygen And You. __   2 February 2008.  __ Welding Tools. __ 2 February 2008 < http://www.omat.ltd.uk/images/welding.jpg>
 * For pictures I used: **