first by positron emission and then two α-particles are emitted in successive radioactive decay. If the product nucleus has a mass number 229 and atomic number 89

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An element X decays, first by positron emission and then two α-particles are emitted in successive radioactive decay. If the product nucleus has a mass number 229 and atomic number 89, the mass number of atomic number of element X are.
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Jun
An element X decays, first by positron emission and then two α-particles are emitted in successive radioactive decay. If the product nucleus has a mass number 229 and atomic number 89, the mass number of atomic number of element X are. An element X decays first by positron emission and then two α-particles are emitted [...]
Posted in: Cengage JEE Mains Physics by B.M Sharma , Chapter 30 - Nuclear Physics ,
Tags: An element X decays , first by positron emission and then two α-particles are emitted in successive radioactive decay. If the product nucleus has a mass number 229 and atomic number 89 , the mass number of atomic number of element X are. ,