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Reference Terms
from Wikipedia, the free encyclopedia


Plutonium is a radioactive, metallic, chemical element.

It has the symbol Pu and the atomic number 94.

It is the element used in most modern nuclear weapons.

The most important, albeit not most stable, isotope of plutonium is 239Pu, with a half-life of 24,110 years.

Note:   The above text is excerpted from the Wikipedia article "Plutonium", which has been released under the GNU Free Documentation License.
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Matter & Energy News
February 24, 2017

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updated 12:56 pm ET