An element X decays first by positron emission and then two `alpha`-particles are emitted in succesive radioactive decay. If the

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 are
A. 273,93
B. 237,94
C. 238,93
D. 237,92

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

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