Asked by Lily
                what are the effects of oxygen on medal.
            
            
        Answers
                    Answered by
            Ms. Sue
            
    On medal or metal?
    
                    Answered by
            Lily
            
    medals like an olympic metal 
    
                    Answered by
            Ms. Sue
            
    What kind of metal is used for Olympic medals?
    
                    Answered by
            DrBob222
            
    http://chemistry.about.com/od/metalsalloys/f/what_are_olympic_medals_made_of.htm
    
                    Answered by
            DrBob222
            
    On the gold medals that outside layer is gold plated and oxygen will have little effect on it. For the silver medals, oxygen will tarnish silver over time forming either silver oxide or silver sulfide or both (think household silverware made with silver or silver plate--the silver must be "polished" now and then.) Bronze darkens on long exposure to oxygen due to the formatiion of copper oxide.. 
    
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