Answer: plutonium

AnswerCrossword Clue
PLUTONIUMRadioactive element
PLUTONIUMManhattan Project element
PLUTONIUMDangerous element
PLUTONIUMElement no. 94, formed from U. 238.
PLUTONIUMRadioactive element isolated in 1940.
PLUTONIUMFissionable element.
plutoniuma naturally radioactive, silvery, metallic transuranic element
plutoniumThe chemical element of atomic number 94, a dense silvery radioactive metal of the actinide series, used as a fuel in nuclear reactors and as an explosive in nuclear fission weapons. Plutonium only occurs in trace amounts in nature but is manufactured in nuclear reactors from uranium-238