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Chemical Bonding

NIOS · Class 12 · Chemistry

Quick revision notes for Chemical Bonding — NIOS Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

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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
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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)
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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
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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

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Full Notes

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

Frequently Asked Questions

What are the important topics in Chemical Bonding for NIOS Class 12 Chemistry?
Chemical Bonding covers several key topics that are frequently asked in NIOS Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Chemical Bonding — NIOS Class 12 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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