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Natural plutonium exist only in extremely traces (parts per trillion) in uranium ores.
Plutonium has the same composition as uranium, except for the fact that it contains one more neutron and one more proton. Actually Plutonium-239 has 2 more protons and 2 more neutrons than Uranium-235.
It is relative easy to obtain uranium; the preparation of plutonium is more difficult and extremely dangerous.
No, plutonium is a different element entirely.
The Pauling electronegativity of uranium is 1,38; the Pauling electronegativity of plutonium is 1,28.So, plutonium is a bit more chemically reactive than uranium.
The critical mass of plutonium is lower, plutonium is not so expensive as highly enriched uranium, the technology to obtain plutonium is more simple than the isotopic separa-tion of uranium, etc.
Uranium and plutonium can form alloys.
Plutonium and uranium can form alloys.
It is known that uranium 238 is found in meteorites and Plutonium 242 is found in very small amounts naturally in Uranium ores here on earth. So I would take a guess that in meteorites where uranium is found, tiny amounts of plutonium 242 will also be found.
Plutonium is more toxic and radioactive.
No, plutonium is used more. Uranium can only be used in gun type nuclear weapons, which are rarely used.
The 3 least abundant elements are Francium (Fr), Astatine (At),and Plutonium (Pu). Francium and Astatine come from the decay of Thorium (Th) and Uranium (U), are much more abundant. At any one time in the entire earth's crust there is only 30 grams of Francium and 25 grams of Astatine. Plutonium is only found in Uranium minerals. The amount of Plutonium is microscopic. Here are the 3 least abundant elements. Lowest 3. 89. Francium 90. Astatine 91. Plutonium