As a result of his study of radioactive elements, Frederick Soddy concluded in 1913 that an element might occur in more than one form. The multiple forms of the element all have the same atomic number, but different atomic weights. Soddy referred to...

Isotope separation is the process of concentrating specific isotopes of a chemical element by removing other isotopes, for example separating natural uranium into enriched uranium and depleted uranium. This is a crucial process in the creation of a...