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Atomic Structure — Revision Notes

Telangana Open School (TOSS) · Class 12 · Chemistry

Atomic Structure revision notes for Telangana Open School (TOSS) Class 12 Chemistry: 4 topics in quick points.

44 questions30 flashcards10 formulas & key relations5 concepts

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Key Topics to Revise

1

Fundamental Particles of the Atom

  • Atoms are composed of three fundamental subatomic particles: electrons, protons, and neutrons.
  • Electrons are negatively charged, very light particles found outside the nucleus.
  • Protons are positively charged and located in the nucleus; they are approximately 1840 times heavier than electrons.
2

Evolution of Atomic Models

  • J.J. Thomson proposed the 'plum pudding model' where electrons are embedded in a positively charged sphere.
  • Rutherford's alpha-particle scattering experiment showed that most of the atom is empty space with a dense, positively charged nucleus at the center.
  • Most alpha particles passed straight through the gold foil, some were deflected slightly, and a very few bounced back, indicating a concentrated positive charge.
3

Electromagnetic Radiation and Spectra

  • Electromagnetic radiation (EMR) consists of oscillating electric and magnetic fields that travel through space at the speed of light (3 × 10⁸ m/s).
  • EMR does not require a medium and includes visible light, radio waves, X-rays, etc.
  • Key parameters: wavelength (λ), frequency (ν), wave number (ν̄), amplitude, and velocity (c = νλ).
4

Bohr's Model of the Atom

  • Bohr proposed that electrons revolve in fixed circular orbits (stationary states) without radiating energy.
  • Electrons can jump between orbits by absorbing or emitting photons of energy ΔE = hν.
  • Angular momentum is quantized: mvr = nh/(2π), where n is the principal quantum number.

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Full Notes

Key Concepts

Atoms are made up of threeBased on the alphaNiels Bohr proposed that electrons moveLouis de Broglie proposed that matterIt states that it is impossible

Frequently Asked Questions

What are the important topics in Atomic Structure for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in Atomic Structure include Fundamental Particles of the Atom, Evolution of Atomic Models, Electromagnetic Radiation and Spectra, Bohr's Model of the Atom. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Atomic Structure for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Atomic Structure. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

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

More resources for Atomic Structure

All Telangana Open School (TOSS) Class 12 Chemistry Revision Notes

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