What happens to the mass number of a radioactive isotope during alpha emission?
Answer:
alpha emissons emit 1 alpha particle. 4/2 He (where 4 is the mass number, A = Z+N, and 2 is the atomic number , the number of protons) an example emission would be 238/92 U --> 234/90Th + 4/2He
Alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (two protons and two neutrons bound together into a particle identical to a helium nucleus) and transforms (or 'decays') into an atom with a mass number 4 less and atomic number 2 less
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