Plutonium is an element, number 94 on the periodic table.

Hutzelite 27 was an explosive material derived from plutonium. (TNG: "Night Terrors")

Plutonium was named after the planet Pluto.
The Phoenix was described as having a plutonium core in the script of Star Trek: First Contact. In this early script, Cochrane's plan was said to be to use a Nuclear warhead to ignite the warp core.

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