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The most common isotope of plutonium is Pu-239. Ejecting four protons and four neutrons would reduce the atomic number from 94 to 90 and the mass number from 239 to 231. Element #90 is Thorium, so the answer would be Thorium-231.

However, that is not an actual decay mode for Pu-239. Pu-239 decays by emitting an alpha particle (two protons and two neutrons) to Uranium-235. U-235 can then further decay by emitting another alpha particle to form Th-231.

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