Scattering of α-particles by a thin gold foil suggests the presence of
electron in an atom
proton in an atom
positively charged nucleus at the centre of an atom
isotopes of gold
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This question was previously asked in
UPSC CDS-1 – 2020
The deflection of positively charged alpha particles at large angles, and the reflection of a few back towards the source, indicated that they were encountering a strong positive charge concentrated in a very small volume within the atom, which was termed the nucleus.