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(C) Let the initial atom be $^m_Z X$. After the emission of an $\alpha$-particle $(^4_2 He)$,the nucleus becomes $^{m-4}_{Z-2} Y$. Then,after the emis

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Isotope

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(C) Let the initial atom be $^m_Z X$. After the emission of an $\alpha$-particle $(^4_2 He)$,the nucleus becomes $^{m-4}_{Z-2} Y$. Then,after the emission of two $\beta$-particles $(^0_{-1} e)$,the mass number remains $m-4$ and the atomic number becomes $(Z-2) + 2 = Z$. Since the final element has the same atomic number $Z$ as the initial atom,it is an isotope.

Successive emission of an $\alpha$-particle and two $\beta$-particles by an atom of an element results in the formation of its

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