Chemical Bonding and Molecular Structure
1. Introduction
Chemical Bonding is the fundamental process by which atoms combine to form molecules
and compounds. Atoms achieve stability by sharing or transferring electrons, leading to the
formation of different types of bonds. Understanding chemical bonding is essential for
predicting the structure, properties, and reactivity of molecules, making it a crucial topic for
NEET and JEE aspirants.
Importance of Chemical Bonding:
Explains why compounds form and their stability
Determines physical and chemical properties
Helps understand molecular structure, shape, and polarity
Foundation for advanced chemistry topics like hybridization, molecular orbital theory, and
coordination compounds
2. Types of Chemical Bonds
1) Ionic Bond (Electrovalent Bond)
Definition:
Ionic bond is formed when one atom transfers electrons to another atom to achieve a stable
electronic configuration. Usually occurs between metals and non-metals.
Characteristics:
Formation of cations (+) and anions (−)
High melting and boiling points
Soluble in water, conducts electricity in molten/aqueous state
Crystalline solid at room temperature
, Examples:
NaCl (Sodium Chloride)
KBr (Potassium Bromide)
Diagram (Easy):
2. Covalent Bond
Definition:
Covalent bond is formed when two atoms share one or more pairs of electrons to achieve
stability. Usually occurs between non-metals.
Characteristics:
Low melting and boiling points compared to ionic compounds
Poor conductor of electricity
Molecules can be polar or non-polar depending on electronegativity
Examples:
H₂ (single bond)
O₂ (double bond)
N₂ (triple bond)
H₂O (polar covalent)
Diagram (Easy):
H:H (single bond)
1. Introduction
Chemical Bonding is the fundamental process by which atoms combine to form molecules
and compounds. Atoms achieve stability by sharing or transferring electrons, leading to the
formation of different types of bonds. Understanding chemical bonding is essential for
predicting the structure, properties, and reactivity of molecules, making it a crucial topic for
NEET and JEE aspirants.
Importance of Chemical Bonding:
Explains why compounds form and their stability
Determines physical and chemical properties
Helps understand molecular structure, shape, and polarity
Foundation for advanced chemistry topics like hybridization, molecular orbital theory, and
coordination compounds
2. Types of Chemical Bonds
1) Ionic Bond (Electrovalent Bond)
Definition:
Ionic bond is formed when one atom transfers electrons to another atom to achieve a stable
electronic configuration. Usually occurs between metals and non-metals.
Characteristics:
Formation of cations (+) and anions (−)
High melting and boiling points
Soluble in water, conducts electricity in molten/aqueous state
Crystalline solid at room temperature
, Examples:
NaCl (Sodium Chloride)
KBr (Potassium Bromide)
Diagram (Easy):
2. Covalent Bond
Definition:
Covalent bond is formed when two atoms share one or more pairs of electrons to achieve
stability. Usually occurs between non-metals.
Characteristics:
Low melting and boiling points compared to ionic compounds
Poor conductor of electricity
Molecules can be polar or non-polar depending on electronegativity
Examples:
H₂ (single bond)
O₂ (double bond)
N₂ (triple bond)
H₂O (polar covalent)
Diagram (Easy):
H:H (single bond)
