Chemical Bonding
Telangana Open School (TOSS) · Class 12 · Chemistry
Complete topic list for Chemical Bonding in Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Chemical Bonding
Chemical Bond and Octet Rule
- A chemical bond forms when atoms combine to lower their overall energy.
- Atoms achieve stability by attaining 8 electrons in their valence shell (octet rule), similar to noble gases.
- The octet rule is based on the inertness of noble gases with ns²np⁶ configuration.
Ionic Bonding
- Ionic bonds form by complete transfer of electrons from a metal to a non-metal.
- Cation formation is favored by low ionization energy, large atomic size, and low positive charge.
- Anion formation is favored by high electron affinity, small atomic size, and low negative charge.
Covalent Bonding and Polar Bonds
- Covalent bonds form by sharing of electron pairs between atoms.
- Each atom contributes one electron to the shared pair.
- Polar covalent bonds occur when electrons are unequally shared due to electronegativity difference.
VSEPR Theory and Molecular Shapes
- VSEPR theory predicts molecular geometry based on electron pair repulsion around the central atom.
- Electron pairs (bonding and lone) arrange to minimize repulsion: LP-LP > LP-BP > BP-BP.
- Geometry depends on total electron pairs; shape depends on bonding-lone pair distribution.
Key Concepts
Central concept: Chemical Bonding
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