This is because uranium is man made.
Plutonium and xenon are radioactive elements. Plutonium is a synthetic element, while xenon occurs naturally but can also be produced synthetically. Barium and cesium are not synthetic elements but can have radioactive isotopes.
Yes, plutonium is an artificial element, man made.
Plutonium is an artificial element; natural plutonium exist only in extremely traces.
Plutonium is a synthetic element that is radioactive. It does not occur naturally in nature and must be artificially produced through the nuclear fission of uranium.
Yes, sulfur, hydrogen, and plutonium can be found in organic compounds. Sulfur is commonly found in amino acids, such as cysteine and methionine. Hydrogen is present in virtually all organic compounds, as it forms covalent bonds with carbon. Plutonium can be incorporated into organic compounds through synthetic processes in laboratories, but naturally occurring organic compounds with plutonium are rare.
Pretty much all elements after Uranium are synthetic (made by man) Any element above 94 (plutonium and neptunium were also discovered in extremely small concentrations in uranium minerals), are all considered synthetic since they do not occur naturally on the earth, but were made under laboratory conditions.
Some isotopes of cesium are radioactive and synthetic, as indicated in recent news reports about the Japanese nuclear reactor damaged by the recent severe earthquake/tsunami. (The radioactive cesium reported was formed by atomic fission of uranium and/or plutonium in the reactor.) However, most cesium is neither radioactive nor synthetic!
Some plutonium chemical compounds; plutonium dioxide, plutonium nitride, plutonium carbide, plutonium nitrate, plutonium trifluoride, plutonium chloride, etc.
Examples: PuO2, plutonium nitrate, plutonium carbide, plutonium chloride, plutonium fluoride etc.
There's no plutonium here. I haven't even seen any plutonium, recently.
Some plutonium compounds: Hydrides: Plutonium dihydride: PuH2, Plutonium trihydride: PuH3 Fluorides: Plutonium trifluoride: PuF3, Plutonium hexafluoride: PuF6, Plutonium tetrafluoride: PuF4 Chlorides: Plutonium trichloride: PuCl3 Bromides: Plutonium tribromide: PuBr3 Iodides: Plutonium triiodide: PuI3 Oxides: Plutonium oxide: PuO, Plutonium dioxide: PuO2, Diplutonium trioxide: Pu2O3 Sulfides: Plutonium sulphide: PuS, Plutonium disulphide: PuS2, Diplutonium trisulphide: Pu2S3 Selenide: Plutonium selenide: PuSe Nitrides: Plutonium nitride: PuN Carbides: PuC, Pu2C3 Borides: PuB2,Pu2B4, PuB6, PuB100 Nitrate : Plutonium (III) nitrate: Pu(NO3)3, Plutonium (IV) nitrate: Pu(NO3)4 And many others.
Pure plutonium contain only plutonium atoms.