Eighty out of the first 82 elements in the periodic table have stable isotopes. Measuring and analysing their distribution allows for many practical applications. The IAEA assists Member States in ...

The story of the last element to be discovered out of the first 92 catalogued in the periodic table is told by Eric ... turned out to be spurious. Traces of Tc in rocks contradict the common ...

The high relative abundance of these tellurium isotopes gives tellurium ... so these elements are in the correct order in the modern periodic table.