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An element X decays first by positron emission and then two `alpha`-particles are emitted in succesive radioactive decay. If the product nucleus has a mass number 229 andd atomic number 89, the mass number and atomic number of element X areA. 273,93B. 237,94C. 238,93D. 237,92 |
Answer» Correct Answer - b Protons are never given out during radioactive change. |
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