A) \[Y_{Z}^{A}-2\]
B) \[Y_{Z-4}^{A-4}\]
C) \[Y_{Z}^{A-4}\]
D) \[X_{Z}^{A}\]
Correct Answer: C
Solution :
Key Idea: \[\beta -\]particles are fast moving electrons. When\[\alpha -\]particle is emitted by an atom, its atomic number decreases by 2 and mass number by 4. \[\therefore \] \[_{Z}^{A}X\xrightarrow{\alpha }_{Z-2}^{A-4}M\] When \[\beta -\]particle is emitted, the atomic number increases by 1, while mass number remains unchanged, therefore \[_{Z-2}^{A-4}M\xrightarrow{2\beta }_{\,\,\,\,\,\,Z}^{A-4}Y\]
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