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Structure of Atom — Syllabus

ICSE · Class 11 · Chemistry

What Structure of Atom covers in ICSE Class 11 Chemistry: 4 topics, for the 2026-27 session. Part of the ICSE Class 11 Chemistry syllabus.

89 questions56 flashcards8 formulas & key relations5 concepts

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A labeled diagram illustrating J.J. Thomson's cathode ray tube experiment, showing the generation of cathode rays, their deflection by electric and magnetic fields, and how this led to the discovery o
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4 Topics · ICSE Class 11 Chemistry · 2026-27

Topics in Structure of Atom

1

1. Fundamental Particles and Early Atomic Ideas

  • Matter is made of extremely small atoms.
  • Atoms of the same element are alike and differ from atoms of other elements.
  • The three fundamental subatomic particles are electron, proton, and neutron.
2

2. Atomic Number, Mass Number, Isotopes and Isobars

  • Atomic number is the number of unit positive charges on the nucleus.
  • For a neutral atom, atomic number equals number of protons and electrons.
  • Mass number is the sum of protons and neutrons in the nucleus.
3

3. Nature of Light and Electromagnetic Radiation

  • Wave theory explains reflection, refraction, interference and diffraction.
  • Wave theory cannot explain black body radiation and photoelectric effect.
  • Planck proposed that radiant energy is emitted or absorbed as quanta or photons.
4

4. Planck's Theory and Photoelectric Effect

  • Energy is emitted or absorbed in discrete packets.
  • Photoelectric effect is the emission of electrons from a metal surface when light falls on it.
  • Threshold frequency is the minimum frequency needed to eject electrons.

Key Concepts

Central concept: Structure of Atom

Atomic nature of matterFundamental subatomic particlesDiscovery of electronDiscovery of protonAtomic modelsRutherford's experimentDiscovery of neutronAtomic number and mass number

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Frequently Asked Questions

What are the important topics in Structure of Atom for ICSE Class 11 Chemistry?
Key topics in Structure of Atom include Fundamental Particles and Early Atomic Ideas, Atomic Number, Mass Number, Isotopes and Isobars, Nature of Light and Electromagnetic Radiation, Planck's Theory and Photoelectric Effect. Study these first, then practise questions on each for Class 11 exams.
How should I revise Structure of Atom for Class 11 exams?
Learn the core ideas first, then work through the 89 practice questions on Structure of 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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