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At least three times discoveries of the element 93 were falsely reported, as bohemium , ausonium in 1934 and then sequanium in 1939. Neptunium (named for the planet Neptune , the next planet out from Uranus , after which uranium was named) was discovered by Edwin McMillan and Philip

Plutonium is the heaviest naturally occurring or primordial element . The most stable isotope of plutonium is plutonium-244 , with a half-life of about 80 million years, long enough to be found in trace quantities in nature. [ 3 ] The most important isotope of plutonium is plutonium-239

Seaborg was the principal or co-discoverer of ten elements: plutonium , americium , curium , berkelium , californium , einsteinium , fermium , mendelevium , nobelium and element 106, which was named seaborgium in his honor while he was still living. He also developed more than 100 atomic

Many contemporary uses of uranium exploit its unique nuclear properties. Uranium-235 has the distinction of being the only naturally occurring fissile isotope . Uranium-238 is fissionable by fast neutrons, and is fertile , meaning it can be transmuted to fissile plutonium-239 in a nuclear

Pure americium has a silvery and white luster . At room temperature it slowly tarnishes in dry air. It is more silvery than plutonium or neptunium and apparently more malleable than neptunium or uranium . Alpha emission from 241 Am is approximately 3.5 times that of 226 radium . 241 Am

The nuclear fuel cycle , also called nuclear fuel chain , is the progression of nuclear fuel through a series of differing stages. It consists of steps in the front end , which are the preparation of the fuel, steps in the service period in which the fuel is used during reactor operation

Radioactivity diminishes over time, so in principle the waste needs to be isolated for a period of time until it no longer poses a hazard. This can mean hours to years for some common medical or industrial radioactive wastes, or thousands of years for high-level wastes from nuclear power plants

Californium is one of the few transuranium elements that have practical applications. These are application that take advantage of the property of certain isotopes of californium to emit neutrons . For example, californium can be used for starting up nuclear reactors , and also as a source

primary mode after is beta emission . The primary decay products before Pu-244 are uranium and neptunium isotopes (neglecting the wide range of daughter nuclei created by fission processes), and the primary products after are americium isotopes. [ edit ] Production and uses A pellet