👉 protactinium is a naturally occurring radioactive element, found in the Earth's crust and ocean. It is one of the 107 known isotopes of uranium that are not present in nature. Protactinium is a rare element that has been used for medical purposes due to its ability to form nuclear fusion reactions, which can be used as a source of energy. Protactinium was first synthesized in 1934 by the American physicist Edward Teller, who isolated it from uranium
