Uranium 235 undergoes an alpha decay to produce thorium 231


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Uranium-235 decays naturally, by alpha decay. Write the balance decay equation below

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Answer

92U^235→90Th^231+2He^4

Explanation

Uranium-235 produces thorium-231 by alpha decay.

An α-particle is a helium nucleus. It contains 2 protons and 2 neutrons, for a mass number of 4.

During α-decay, an atomic nucleus emits an alpha particle. It transforms (or decays) into an atom with an atomic number 2 less and a mass number 4 less.

Thus, uranium-238 decays through α-particle emission to form thorium-231  

92U^235  → 90Th^231  + 2He^4


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