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Syllabus

Structure of the Atom — Syllabus

Madhya Pradesh Board · Class 9 · Science

What Structure of the Atom covers in Madhya Pradesh Board Class 9 Science: 4 topics, for the 2026-27 session. Topics include Discovery of Sub-atomic.

44 questions24 flashcards2 formulas & key relations5 concepts

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An illustration of J.J. Thomson's atomic model, depicting an atom as a sphere of uniformly distributed positive charge with electrons (plums) embedded within it.
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4 Topics · Madhya Pradesh Board Class 9 Science · 2026-27

Topics in Structure of the Atom

1

Discovery of Sub-atomic Particles

  • Atoms are not indivisible but contain smaller particles called sub-atomic particles
  • Three main sub-atomic particles: electrons, protons, and neutrons
  • J.J. Thomson discovered electrons in 1897 using cathode ray tube experiments
2

Atomic Models

  • Thomson's Model (1904): 'Plum pudding' or 'watermelon' model - electrons embedded in positive sphere
  • Rutherford's Model (1911): Nuclear model with electrons revolving around nucleus
  • Rutherford's alpha particle scattering experiment revealed the nucleus
3

Electronic Configuration and Bohr-Bury Rules

  • Electrons are arranged in shells or energy levels around the nucleus
  • Shells are designated as K, L, M, N or n = 1, 2, 3, 4
  • Maximum electrons in shell = 2n² where n is shell number
4

Valency

  • Valency is the combining capacity of an atom
  • Determined by the number of valence electrons
  • Atoms tend to achieve stable electronic configuration (octet in outermost shell)

Key Concepts

Atoms contain three fundamental particlesProposed that atoms are like ChristmasBased on alphaElectrons revolve in fixed orbits (KElectrons fill shells following rules

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Frequently Asked Questions

What are the important topics in Structure of the Atom for Madhya Pradesh Board Class 9 Science?
Key topics in Structure of the Atom include Discovery of Sub-atomic Particles, Atomic Models, Electronic Configuration and Bohr-Bury Rules, Valency. Study these first, then practise questions on each for Class 9 exams.
How should I revise Structure of the Atom for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Structure of the Atom. 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.

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All Madhya Pradesh Board Class 9 Science Syllabus

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