Question: Thorium is an element with atomic number 9 0 . Thorium - 2 3 4 is a radioactive isotope, which decays by emitting a particle

Thorium is an element with atomic number 90. Thorium-234 is a radioactive isotope, which decays by emitting a particle with a kinetic energy of 0.27 MeV and a half-life of 24 days

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