Chapter 15 of 16
Syllabus
Structure of Atoms and Nuclei — Syllabus
Maharashtra Board · Class 12 · Physics
What Structure of Atoms and Nuclei covers in Maharashtra Board Class 12 Physics: 4 topics, for the 2026-27 session.
45 questions24 flashcards5 concepts
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4 Topics · Maharashtra Board Class 12 Physics · 2026-27
Topics in Structure of Atoms and Nuclei
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)
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
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What are the important topics in Structure of Atoms and Nuclei for Maharashtra Board Class 12 Physics?
Key topics in Structure of Atoms and Nuclei include Historical Development of Atomic Models, Rutherford's Atomic Model and Its Limitations, Atomic Spectra and Line Series, Bohr's Atomic Model. Study these first, then practise questions on each for the Maharashtra Board Class 12 board exam.
How should I revise Structure of Atoms and Nuclei for the Maharashtra Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Structure of Atoms and Nuclei. Revise definitions regularly and use flashcards for quick recall before the exam.
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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