A) 170, 69
B) 172, 69
C) 172,70
D) 170,70
Correct Answer: B
Solution :
Key Idea: p-particle is fast moving electro and \[\alpha \]-particle is doubly ionized helium atom. When an atom emits an \[\alpha \]-particle its mass number decreases by 4 and atomic number by 2, when it emits a \[\beta \]-particle its mass number increases by 1, while there is no change in atomic number and mass number in \[\gamma \]-ray emission. \[_{72}{{X}^{180}}{{\xrightarrow{-\alpha }}_{70}}{{Y}^{176}}\xrightarrow{-\beta }\] \[_{71}{{X}^{176}}{{\xrightarrow{-\alpha }}_{69}}{{Y}^{176}}{{\xrightarrow{-\gamma }}_{69}}{{p}^{172}}\].
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