A) 172 and 69
B) 174 and 70
C) 176 and 69
D) 176 and 70
Correct Answer: A
Solution :
\[_{72}{{A}^{180}}\xrightarrow{\alpha }{{\,}_{70}}{{A}_{1}}^{176}\xrightarrow{\beta }{{\,}_{71}}{{A}_{2}}^{176}\xrightarrow{\alpha }{{\,}_{69}}{{A}_{3}}^{172}\]\[\xrightarrow{\gamma }{{\,}_{69}}{{A}_{4}}^{172}\]
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