Colourium(USA: Colorium) is a hypothetical element with the atomic number 853. It is named after the visual perception of light, colour(USA: color). Like all elements after lead(excluding stableisotopium), Colourium/Colorium has no stable isotopes. Its most stable isotope is 2132Coo. It is the first element since Sulfur/Sulphur to have different names in British & American English.
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