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Noun(1) a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium(2) a radioactive transuranic metallic element(3) found in trace amounts in uranium ores(4) a by-product of the production of plutonium

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(1) The Berkeley cyclotron created many elements never found in nature - including plutonium, which directly follows neptunium in the table.(2) In Basra they have found the bombs that were used had enriched uranium in them - neptunium .(3) They had to be named after the next two planets, and so were called neptunium and plutonium - both found at Berkeley using the new cyclotron.(4) As beta decay does not change the atomic mass, the isotope of the new element number 93, neptunium , also has mass 239.(5) The new elements were named neptunium and plutonium, respectively.(6) Just as Neptune comes right after Uranus in the solar system, so, too, does neptunium come right after uranium in the periodic table.(7) All isotopes of neptunium are radioactive, the longest lived being neptunium - 237 with a half life of 2,140,000 years.(8) When struck by neutrons, nuclei of neptunium and other nuclear materials can fission into two smaller nuclei.(9) Each tank round is 10 pounds of solid uranium - 238 contaminated with plutonium, neptunium , americium.(10) They produced neptunium , which decayed by beta emission, shunting the element one place further along the Periodic Table.