Rutherford’s accelerating electrons should radiate energy and collapse into the nucleus, causing atomic instability. Bohr resolved this by proposing that electrons revolve in discrete non-radiating orbits called stationary states, preventing atomic collapse.
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Options (ii) and (iii) are correct because alpha particle scattering revealed a tiny, dense, positive nucleus, disproving Thomson’s model. Options (i) and (iv) are incorrect because neutrons were discovered later and deflections did not trace electron movement.
Chapter 8 “Journey Inside the Atom” explains the structure of atoms and discovery of subatomic particles. It covers electrons, protons, neutrons and atomic models, helping me understand the basic composition and properties of matter clearly.