A nucleus _n^mX emits one alpha particle and | vedclass

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(B) The initial nucleus is given as $_n^mX$, where $m$ is the mass number and $n$ is the atomic number.An $\alpha$ particle is a helium nucleus, denot

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$_{n}^{m-4}Z$

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(B) The initial nucleus is given as $_n^mX$, where $m$ is the mass number and $n$ is the atomic number.An $\alpha$ particle is a helium nucleus, denoted as $_2^4He$. When a nucleus emits an $\alpha$ particle, the mass number decreases by $4$ and the atomic number decreases by $2$.After emitting one $\alpha$ particle, the nucleus becomes $_{n-2}^{m-4}X'$.$A$ $\beta^-$ particle is an electron, denoted as $_{-1}^0e$. When a nucleus emits a $\beta^-$ particle, the mass number remains unchanged and the atomic number increases by $1$.Since two $\beta^-$ particles are emitted, the atomic number increases by $2 	imes 1 = 2$.The final atomic number is $(n-2) + 2 = n$.The final mass number is $m-4$.Thus, the resulting nucleus is $_n^{m-4}Z$.

$A$ nucleus $_n^mX$ emits one $\alpha$ particle and two $\beta^-$ particles. The resulting nucleus is

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