What happens to the oxygen atoms from glucose?
What happens when glucose breaks down? Or what happens when glucose converts to starch? Or are you talking about some other situation?
Since this is not my area of expertise, I searched Google under the key words "glucose 'oxygen atoms'" to get these possible sources:
http://www.newton.dep.anl.gov/askasci/chem03/chem03811.htm
http://curriculum.calstatela.edu/courses/builders/lessons/less/les4/photo.html
(Broken Link Removed)
http://72.14.253.104/search?q=cache:wWv2Oe2Jev4J:www.engr.sjsu.edu/tanagnos/Ecology/Lego%2520Photosynthesis.doc+glucose+%22oxygen+atoms%22&hl=en&ct=clnk&cd=5&gl=us&client=safari
http://www.defrance.org/artman/publish/article_171.shtml
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. If not, you might try your own search. Thanks for asking.