John Marks - 3/25/2000 12:51:19 PM
Niton, Nt, [from the Latin 'nitens' = 'shining']is the name given it by its discoverer, Ramsay, on account of its spontaneous luminescence. 'Radon' is short for 'radium emanation', Nt-222 and is thus merely an isotope of niton. Similarly thoron is Nt-220 and actinion is Nt-219. We do not refer to hydrogen as 'protium'.
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