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Uranium is a natural chemical element, plutonium is an artificial element (but note that plutonium exist also naturally in the earth crust in extremely low concentrations).

Uranium has the atomic number 92 and plutonium 94.

The critical mass of uranium is greater than the critical mass of plutonium.

The melting and boiling points of U and Pu are different.

Uranium has an orthorombic crystalline structure; the structure of plutonium is monoclinic.

And many other physical and chemical properties are different.

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14y ago

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