Physics · 2021
JEE Main · 4 August 2021, Shift 1 · Q4
A hypothetical radioactive nuclei decays according to the following series _72^180 A → α A_1 → β^- A_2 → α A_3 → γ A_4 The atomic number and mass…
A hypothetical radioactive nuclei decays according to the following series
$${ }_{72}^{180} \mathrm{~A} \xrightarrow{\alpha} \mathrm{~A}_1 \xrightarrow{\beta^{-}} \mathrm{A}_2 \xrightarrow{\alpha} \mathrm{~A}_3 \xrightarrow{\gamma} \mathrm{~A}_4
$$
The atomic number and mass number of $\displaystyle \mathrm{A}_4$ will be respectively
Official answer
(1)
$\displaystyle 69, 172$
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JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.