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Atomic Structure

Telangana Board · Class 12 · Chemistry

Quick revision notes for Atomic Structure — Telangana Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

88 questions25 flashcards5 concepts

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Key Topics to Revise

1

Discovery of Fundamental Particles

  • J.J. Thomson discovered the electron in 1897 using cathode ray tube experiments
  • Electrons have negative charge (-1.602 × 10⁻¹⁹ C) and very small mass (9.109 × 10⁻³¹ kg)
  • Protons were discovered as positively charged particles with mass 1840 times heavier than electrons
2

Early Atomic Models

  • Thomson's Plum Pudding Model: Atom is a sphere of positive charge with electrons embedded like plums in pudding
  • Rutherford's Nuclear Model: Dense, positively charged nucleus at center with electrons revolving around it
  • Rutherford's α-particle scattering experiment used gold foil and α-particles (He²⁺ ions)
3

Electromagnetic Radiation and Planck's Theory

  • Electromagnetic radiation consists of oscillating electric and magnetic fields perpendicular to each other
  • Characterized by wavelength (λ), frequency (ν), amplitude, and wave number (ν̄)
  • All electromagnetic radiation travels at speed of light (c = 3 × 10⁸ m/s) in vacuum
4

Hydrogen Spectrum and Bohr's Model

  • Hydrogen spectrum consists of discrete lines, not continuous spectrum
  • Different series: Lyman (UV), Balmer (visible), Paschen (IR), Brackett (IR), Pfund (IR)
  • Rydberg formula: ν̄ = RH[1/n₁² - 1/n₂²] where RH = 109,677 cm⁻¹

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Full Notes

Key Concepts

Atoms consist of three basic particlesRutherford's αElectromagnetic radiation is energy transmitted asBohr proposed that electrons orbitDe Broglie proposed that matter particles

Frequently Asked Questions

What are the important topics in Atomic Structure for Telangana Board Class 12 Chemistry?
Atomic Structure covers several key topics that are frequently asked in Telangana 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 Atomic Structure — Telangana Board Class 12 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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