… or fertile chemical elements and isotopes) and their compounds; mixtures and residues containing these products. …
Explanatory notes
… or fertile chemical elements and isotopes) and their compounds; mixtures and residues containing these products. … (I) ISOTOPES The nuclei of an element, defined by its atomic number, always contain the same number of protons, … which are all called uranium, but their mass number ranges from 227 to 240; they are designated, for example, as …