Rutherford's $\alpha$-particle scattering experiment concluded that:

  • A
    All positively charged particles are concentrated in a very small region of the atom.
  • B
    All negatively charged particles are concentrated in a very small region of the atom.
  • C
    Protons revolve around the electrons.
  • D
    Neutrons are charged particles.

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$A$: Thomson's atomic model is known as the plum pudding model.
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