After \( 1 \alpha \) and \( 2 \beta \)-emissions (a) mass number re...

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After \( 1 \alpha \) and \( 2 \beta \)-emissions
(a) mass number reduces by 6
\( \mathrm{P} \)
(b) mass number reduces by 4
W
(c) mass number reduces by 2
(d) atomic number remains unchanged
(1999)
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