A) 69, 172
B) 172, 69
C) 180, 70
D) 182, 68
Correct Answer: A
Solution :
When an alpha particle is ejected, results in \[\to \]decrease in atomic weight by four units \[\to \]decrease in atomic number of two When a beta particle is ejected, results in \[\to \]no change in atomic weight \[\to \]increase in atomic number by one unit when an y particle is ejected results in \[\to \]no change \[_{72}{{X}^{180}}{{\xrightarrow[{}]{2\alpha }}_{68}}{{A}^{172}}{{\xrightarrow{-1\beta }}_{69}}{{B}^{172}}{{\xrightarrow{Y}}_{69}}{{X}^{172}}\]
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