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You seem a little confused. Sodium does not combust when it comes in contact with air. Sodium does, however, combust violently when it contacts water. You may be thinking about white phosphorus, an allotrope of the same element that is on the end of matches. It does combust when it contacts air.
As far as how to obtain sodium, you are basically out of luck. Breaking the bonds between it and other elements in pretty much any of it's compounds would be really hard (like, forget about it hard). Buying it is out of the question, too. It is so tightly regulated, you can't even transport it on most roads.
EDIT: Ok, well it seems that sodium is nowhere near as tightly regulated as I thought before. I found a website that sells it, but it isn't cheap. How bad do you want it?
Last edited by v1per; May 3rd, 2007 at 12:24 AM..
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