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Chemical Bonding — Syllabus

NIOS · Class 12 · Chemistry

What Chemical Bonding covers in NIOS Class 12 Chemistry: 4 topics, for the 2026-27 session. Part of the NIOS Class 12 Chemistry syllabus.

45 questions35 flashcards2 formulas & key relations5 concepts

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Illustrates the formation of a covalent bond between two atoms by sharing electron pairs, using Lewis dot symbols. Shows how each atom achieves a stable octet (or duplet for hydrogen).
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4 Topics · NIOS Class 12 Chemistry · 2026-27

Topics in Chemical Bonding

1

1. Fundamental Concepts of Chemical Bonding

  • Valence electrons are electrons in the outermost shell that participate in bond formation and determine an atom's combining capacity (valency)
  • Chemical bond formation is driven by the tendency of atoms to achieve stable electronic configuration (noble gas configuration) with lower total energy
  • When two atoms approach each other, the energy of the system decreases if they form a bond, making the combination more stable
2

2. Ionic or Electrovalent Bonding

  • Ionic bonds form through complete electron transfer from one atom to another, creating ions held by electrostatic attraction
  • Highly electropositive elements (metals) lose electrons to become cations (positive ions)
  • Highly electronegative elements (nonmetals) gain electrons to become anions (negative ions)
3

3. Covalent Bonding

  • Covalent bonds form through sharing of electron pairs between atoms, with each atom contributing one electron to the shared pair
  • Lewis structures use dots to represent valence electrons and lines to represent shared electron pairs (bonds)
  • Single bond = 1 shared pair; Double bond = 2 shared pairs; Triple bond = 3 shared pairs
4

4. Bond Polarity and Dipole Moment

  • Bond polarity arises from difference in electronegativity between bonded atoms
  • Electronegativity difference < 1.7 indicates primarily covalent character; > 1.7 indicates significant ionic character
  • Dipole moment (μ) is the product of charge magnitude and distance of separation: μ = Q × r

Key Concepts

Valence electrons are the electronsAn ionic bond forms when oneA covalent bond forms when twoA coordinate covalent bond forms whenBond polarity arises when two bonded

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Frequently Asked Questions

What are the important topics in Chemical Bonding for NIOS Class 12 Chemistry?
Key topics in Chemical Bonding include Fundamental Concepts of Chemical Bonding, Ionic or Electrovalent Bonding, Covalent Bonding, Bond Polarity and Dipole Moment. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Chemical Bonding for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Chemical Bonding. 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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