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 ...

These isotopes are essential for making targets ... ran “cold fusion” experiments that extended the periodic table from element 107 to 112. They bombarded a heavy target of lead or bismuth ...

When the first periodic table was formulated by Mendeleev ... We know this because even the longest-lived isotope of the element has a half-life that is too short in comparison with the age ...

While the number of protons defines the element (e.g., hydrogen, carbon, etc.) and the sum of the protons and neutrons gives the atomic mass, the number of neutrons defines the isotope of that element ...