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Chemical Bonding and Molecular Structure — Syllabus

ICSE · Class 11 · Chemistry

What Chemical Bonding and Molecular Structure covers in ICSE Class 11 Chemistry: 4 topics, for the 2026-27 session.

109 questions36 flashcards6 formulas & key relations5 concepts

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A step-by-step electron dot diagram illustrating the formation of a single covalent bond in a Hydrogen (H2) molecule, showing the mutual sharing of one electron pair to achieve duplet configuration.
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4 Topics · ICSE Class 11 Chemistry · 2026-27

Topics in Chemical Bonding and Molecular Structure

1

1. Why Atoms Combine and the Octet Rule

  • Atoms combine to acquire stability and lower potential energy.
  • Noble gases are stable because their valence shells are complete.
  • Kossel and Lewis proposed that atoms form bonds by gaining, losing, or sharing electrons to achieve noble gas configuration.
2

2. Ionic Bonding and Ionic Compounds

  • An ionic bond is generally formed between a metallic and a non-metallic atom.
  • Ionic bonding happens when electronegativity difference is large.
  • Electropositive atoms lose electrons and become cations; electronegative atoms gain electrons and become anions.
3

3. Born-Haber Cycle and Lattice Energy

  • Born-Haber cycle represents the energy changes in forming an ionic compound from its elements.
  • It is used to calculate lattice energy or heat of formation.
  • For sodium chloride, the steps include sublimation of sodium, ionisation of sodium, dissociation of chlorine, electron gain by chlorine, and lattice formation.
4

4. Covalent Bonding and Covalent Compounds

  • A covalent bond is formed by mutual sharing of electrons between atoms of similar or almost similar electronegativity.
  • Atoms of groups 14, 15, 16, and 17 commonly form covalent bonds.
  • Covalent compounds usually exist as gases, liquids, or soft solids.

Key Concepts

Central concept: Chemical bonding as the force that holds atoms, ions, and molecules together through electron transfer, sharing, delocalisation, and orbital overlap to achieve stability

Cause of chemical combinationElectronic theory of valencyLewis symbols and valencyIonic bondCovalent bondVariable electrovalency and covalencyPolarity in covalent bondsCovalent character in ionic bonds

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Frequently Asked Questions

What are the important topics in Chemical Bonding and Molecular Structure for ICSE Class 11 Chemistry?
Key topics in Chemical Bonding and Molecular Structure include Why Atoms Combine and the Octet Rule, Ionic Bonding and Ionic Compounds, Born-Haber Cycle and Lattice Energy, Covalent Bonding and Covalent Compounds. Study these first, then practise questions on each for Class 11 exams.
How should I revise Chemical Bonding and Molecular Structure for Class 11 exams?
Learn the core ideas first, then work through the 109 practice questions on Chemical Bonding and Molecular 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.

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All ICSE Class 11 Chemistry Syllabus

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