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Structure of Atoms and Nuclei

Maharashtra Board · Class 12 · Physics

Quick revision notes for Structure of Atoms and Nuclei — Maharashtra Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

45 questions24 flashcards5 concepts

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Key Topics to Revise

1

Historical Development of Atomic Models

  • Thomson's model (1903): Atom as uniform positive sphere with embedded electrons
  • Geiger-Marsden experiment (1908-1913): α-particle scattering by gold foil
  • Only 0.14% of α-particles scattered through angles > 0.1°
2

Rutherford's Atomic Model and Its Limitations

  • Nucleus contains 99.9% of atomic mass in volume ~10⁻¹⁵ times that of atom
  • Electrons revolve in circular orbits around nucleus
  • Centripetal force provided by electrostatic attraction
3

Atomic Spectra and Line Series

  • Heated hydrogen gas emits light at specific wavelengths only (line spectrum)
  • Different series: Lyman (UV), Balmer (visible), Paschen (IR), Brackett, Pfund
  • Lines in each series get closer as wavelength decreases
4

Bohr's Atomic Model

  • Three postulates: (1) Electrons in circular orbits, (2) Quantized angular momentum, (3) Photon emission during transitions
  • Angular momentum quantization: L = nh/2π where n = 1,2,3...
  • Stable orbits don't radiate energy (violation of classical physics)

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Full Notes

Key Concepts

Proposed that atoms consist ofAlpha particles were fired atAtoms consist of electrons orbitingModified Rutherford's model with quantum conditionsHydrogen emits light at specific wavelengths

Frequently Asked Questions

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Structure of Atoms and Nuclei covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Structure of Atoms and Nuclei — Maharashtra Board Class 12 Physics?
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Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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