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Oxygen facts - air, gas, atom, , properties, water, Oxygen element chemical symbol atomic number 8. oxygen reactive element easily forms compounds oxides.. http://www.sciencekids.co.nz/sciencefacts/chemistry/oxygen.html P/ ratio - wikipedia, The phosphate/oxygen ratio, p/ ratio, refers amount atp produced movement electrons defined electron transport chain, donated. https://en.wikipedia.org/wiki/P/O_ratio Atom basics - chem4kids.: atoms, Chem4kids.! tutorial introduces atoms chemistry. sections include matter, elements, periodic table, reactions, biochemistry.. http://www.chem4kids.com/files/atom_intro.html