Structure of the Atom
Kerala Board · Class 12 · Physics
Quick revision notes for Structure of the Atom — Kerala Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Historical Development of Atomic Models
- Dalton's atomic theory (1808): Atoms as indivisible particles with all properties of elements
- Thomson's discovery of electrons (1897) led to plum pudding model
- Thomson's plum pudding model: Positive sphere with embedded electrons
Rutherford's Scattering Experiment and Nuclear Model
- Alpha particle scattering experiment setup with gold foil
- Experimental observations: Most particles undeflected, few at large angles
- 1 in 8000 particles scattered at 180° (back-scattered)
Bohr's Atomic Model and Postulates
- Four fundamental postulates of Bohr's model
- Quantization of angular momentum: L = nh/2π
- Stationary states with constant energy (no radiation)
Derivation of Bohr's Radius and Energy Levels
- Step-by-step derivation of orbital radius formula
- Bohr radius a₀ = 0.53 Å for hydrogen ground state
- Radius proportional to n²: rₙ = n²a₀
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Structure of the Atom covers several key topics that are frequently asked in Kerala Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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