In a radioactive series
\( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231} _{91}\phi \)
The particles emitted are respectively
From L → M ⇒ No change in both mass and atomic number, meaning a gamma ray was released
From M → L ⇒ Change in both mass and atomic number, meaning an alpha particle was released
From L → \(\phi\) Change in atomic number only, meaning a beta particle was released
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