collector Posted September 12, 2004 Share Posted September 12, 2004 Spectrum Tubes, offered for sale by Sargent Welch. http://sargentwelch.com/product.asp?pn=WLS68755-30W_EA They offer every (collectable!) gaseous element, except fluorine. Fluorine in glass tubes (not spectral tubes though), se above. Link to comment Share on other sites More sharing options...
collector Posted September 12, 2004 Share Posted September 12, 2004 Difficult question. Should 90 Th (the isotope Th 232), and 92 U (the isotope U 238) be regarded as collectable elements? If making such an exception for 83 Bi, why not for these 2 actinide elements? The difference is that the instability of Bi is a rather new knowledge, because of its very long half life (difficult measurement). But it has been known since discovery of radioactivity that these 2 metals are radioactive. The difference then is quantitative, not qualitative. Link to comment Share on other sites More sharing options...
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