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The artificial plutonium was prepared for the first time in December 1940.
The natural isotope Pu-244 is primordial, as old as the Earth but exist only in traces.

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Which was least likely to have been a component of earth?

Plutonium is least likely to have been a component of Earth as it is a man-made element that is not naturally occurring in significant quantities.


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Why plutonium is the most dangerous element in the Earth?

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