Linked from
The 21 pages that link to Plutonium, each with the reason it gives.
ActinideBroader topic: Plutonium-239 is fissile and is used in nuclear fuel and weapons.
Glenn T. SeaborgBroader topic: Seaborg co-led the work that established plutonium as a new element.
NagasakiRelated: The Nagasaki bomb used plutonium-239 as its fission fuel.
Actinide seriesBroader topic: Its isotopes support reactor fuel cycles and nuclear weapons.