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Alpha particles used by Rutherford in his scattering experiment are:
AProtons in standard practice
BElectrons
CHelium nuclei (He^2+)
DNeutrons
Answer & Solution
Correct answer: C. Helium nuclei (He^2+)
1. Rutherford fired alpha particles at thin gold foil.
2. Alpha particles are emitted by radioactive decay (e.g., from radium).
3. Each is a helium nucleus with 2 protons and 2 neutrons.
4. So alpha particles are doubly charged helium nuclei.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 4 'Atomic Structure'_
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