Question
Write a short note on discovery of proton.
✓
Answer
- After the discovery of nucleus in an atom, Rutherford found that the fast moving $\alpha$particles transmuted nitrogen into oxygen with simultaneous liberation of hydrogen.
$
{ }_7^{14} \mathrm{~N}+{ }_2^4 \alpha \longrightarrow{ }_8^{17} \mathrm{O}+{ }_1^1 \mathrm{H}
$ - He further showed that other elements could also be transmuted similarly and hydrogen was always emitted in the process.
- Based on these observations, he proposed that the hydrogen nucleus must be contained inside nuclei of all the elements. Hence, he renamed hydrogen nucleus as proton.
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