Structure of Atom

Thomson plum pudding model:

  • Electrons are embedded in a bed of positive spheres,
  • Could not explain how atomic mass could be accounted for,
  • Could not explain spectral lines.

Rutherford model:

  • Positively charged particles are located in the central nucleus and electrons revolve around this at high speed,
  • Much like the solar system
  • Could not explain the high stability of an atom

Bohr model:

  • Electrons revolve in fixed energy levels or orbit around a nucleus that contains protons and neutrons,
  • As long as electrons remain in orbits, they do not gain or lose energy

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