Answer:
Alpha particles are helium nuclei, i.e., doubly ionised helium atoms. They are represented as \[_{2}^{4}\]He Given \[_{Z}^{A}X\to \alpha +\Upsilon \] or \[_{Z}^{A}X\to _{2}^{4}He+\Upsilon \] \[\therefore \] Atomic number of\[\Upsilon =Z-2\] Mass number of \[\Upsilon =A-4\]
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