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Structure of Atom

Uttar Pradesh Board · Class 11 · Chemistry

Quick revision notes for Structure of Atom — Uttar Pradesh Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

78 questions25 flashcards5 concepts

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Key Topics to Revise

1

Discovery of Subatomic Particles

  • Dalton's atomic theory (1808) proposed atoms as indivisible particles
  • Cathode ray experiments led to discovery of electrons (1897 by J.J. Thomson)
  • Cathode rays are streams of negatively charged particles (electrons)
2

Atomic Models

  • Thomson's Plum Pudding Model (1898): Positive sphere with embedded electrons
  • Rutherford's Nuclear Model (1911): Dense positive nucleus with orbiting electrons
  • α-particle scattering experiment: Most particles passed through, few deflected, very few bounced back
3

Electromagnetic Radiation and Quantum Theory

  • Electromagnetic radiation has wave properties: frequency (ν), wavelength (λ), amplitude
  • All EM radiation travels at speed of light (c = 3 × 10⁸ m/s) in vacuum
  • Black body radiation couldn't be explained by classical physics
4

Atomic Spectra and Bohr's Atomic Model

  • Line spectra show atoms emit/absorb specific wavelengths only
  • Continuous spectrum shows all wavelengths (like rainbow)
  • Hydrogen spectrum: Lyman (UV), Balmer (visible), Paschen (IR) series

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Full Notes

Key Concepts

Through cathode ray tube experimentsThomson's 'plum pudding' model depicted atomsBohr proposed that electrons moveElectromagnetic radiation exhibits both waveIt's impossible to simultaneously determine

Frequently Asked Questions

What are the important topics in Structure of Atom for Uttar Pradesh Board Class 11 Chemistry?
Structure of Atom covers several key topics that are frequently asked in Uttar Pradesh Board Class 11 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 Atom — Uttar Pradesh Board Class 11 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

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

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