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Which outcome occurs when Plutonium-239 undergoes alpha decay?

A)Formation of Uranium-235 isotope
B)Spontaneous nuclear fission reaction
C)Emission of a beta particle
D)Absorption of a neutron particle

💡 Explanation

Alpha decay involves emitting an alpha particle, therefore the mass number decreases by 4 and the atomic number by 2, resulting in Uranium-235 because alpha emission transmutes elements, rather than causing fission or beta decay.

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