memory beta

Plutonium (symbol Pu) is a chemical element, atomic number 94 on the periodic table.

Characteristics and history

Plutonium, in its most stable form, has an atomic mass of 244, and was discovered by Humans for the first time in the United States of America on Earth's North American continent in the year 1940. This element is part of the actinide series of heavy elements. (ST reference: Star Fleet Medical Reference Manual)

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