ChemistryFundamental ConceptNCTB রসায়ন অধ্যায় ৫ (রাসায়নিক বন্ধন)

Chemical Bond

Bengali: রাসায়নিক বন্ধন•Pronunciation: কেমিক্যাল বন্ড•Symbol: — (বন্ড)

Standard Definition:

A lasting attraction between atoms, ions, or molecules that enables the formation of chemical compounds.

📐 Mathematical Equation, Units & Dimensions

Defining Mathematical Equation

\Delta H_{\text{bond}} = E_{\text{reactants}} - E_{\text{products}}

Standard SI Unit

Bond energy: kJ/mol(বন্ধন শক্তি: $kJ/mol$)

Dimensional Analysis

[M L^2 T^{-2} N^{-1}]

CGS Unit

kcal/mol

📖 Physical Concept & Comprehensive Explanation

Atoms bind chemically to achieve closed-shell electron stability. The primary types are ionic bonding (electrostatic attraction between opposite ions), covalent bonding (shared valence electron pairs), and metallic bonding (cations immersed in a delocalized sea of electrons).

🎯 High-Yield Revision Points

✓3 primary classes: ionic, covalent, and metallic bonds.
✓Ionic solids exhibit high melting points and electrical conductivity in solution.
✓Bond formation is exothermic, releasing stabilizing energy.