satrohraj Posted February 7, 2007 Share Posted February 7, 2007 At least 10 ... Thank you. Link to comment Share on other sites More sharing options...
insane_alien Posted February 7, 2007 Share Posted February 7, 2007 umm, there are none. an atom of any lement that was synthesised in a lab and an atom of the same type that was picked up off the ground would be indistinguishable. Link to comment Share on other sites More sharing options...
satrohraj Posted February 8, 2007 Author Share Posted February 8, 2007 i didn't mean that, man made elements like technicium...nd natural elements like hYdrogen or something.. Thank You Link to comment Share on other sites More sharing options...
John Cuthber Posted February 8, 2007 Share Posted February 8, 2007 Well, the man made ones are horribly expensive and they are radioactive (but so are some natural elements). Link to comment Share on other sites More sharing options...
Klaynos Posted February 8, 2007 Share Posted February 8, 2007 Man made ones haven't been found in nature yet.... we bangem out in reactors and accelerators, that's about it isn't it? Link to comment Share on other sites More sharing options...
insane_alien Posted February 8, 2007 Share Posted February 8, 2007 well, you could go into te chemical properties but theres the same differences between 2 natural elements. Link to comment Share on other sites More sharing options...
swansont Posted February 8, 2007 Share Posted February 8, 2007 At least 10 ... Thank you. Sounds like homework to me. And a job for Google and a periodic table. Have at it! Link to comment Share on other sites More sharing options...
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