Atomic bonding
Atomic Bonding
What is Atomic Bonding?
Atomic bonding (or chemical bonding) is the process by which atoms join together to form molecules and compounds. Atoms bond to become more stable by gaining, losing, or sharing electrons. These bonds are responsible for the formation of all matter around us.
Key Points:
Atomic bonding is the force that holds atoms together.
Atoms bond to become more stable.
Bonding involves the outermost (valence) electrons.
Chemical bonds form molecules and compounds.
Different types of bonding produce materials with different properties.
Almost everything around us exists because of atomic bonding.
Types of Bonding
There are three main types of chemical bonding:
Ionic Bonding
Ionic bonding occurs when one atom transfers electrons to another atom. It usually forms between a metal and a non-metal, creating positively and negatively charged ions that attract each other.
Key Points:
Formed between a metal and a non-metal.
Electrons are transferred from one atom to another.
Produces positive (cation) and negative (anion) ions.
Opposite charges attract to form the bond.
Forms strong crystal lattice structures.
Conducts electricity when molten or dissolved in water.
Usually has high melting and boiling points.
Often hard and brittle.
Examples:
Sodium chloride
Magnesium oxide
Calcium fluoride
Covalent Bonding
Covalent bonding occurs when two non-metal atoms share electrons. Sharing allows each atom to achieve a stable outer electron shell.
Key Points:
Formed between non-metals.
Electrons are shared between atoms.
Can form single, double, or triple bonds.
Usually does not conduct electricity.
Can exist as gases, liquids, or solids.
Forms molecules and giant covalent structures.
Often has lower melting and boiling points than ionic compounds.
Examples:
Water
Carbon dioxide
Methane
Oxygen
Metallic Bonding
Metallic bonding occurs between metal atoms. The outer electrons are free to move throughout the metal, forming a "sea of delocalized electrons" that holds the metal ions together.
Key Points:
Formed between metal atoms.
Contains a sea of delocalized electrons.
Excellent conductor of heat and electricity.
Metals are malleable and ductile.
Usually has high melting and boiling points.
Gives metals their shiny appearance (lustre).
Produces strong, durable materials.
Examples:
Copper
Iron
Aluminium
Gold
What Do These Bonds Do?
Ionic Bonding
Forms salts and many minerals.
Creates strong crystal structures.
Allows electricity to flow when melted or dissolved.
Produces stable compounds used in everyday life.
Covalent Bonding
Forms the molecules needed for life.
Creates water, oxygen, proteins, DNA, and plastics.
Holds atoms together by sharing electrons.
Produces millions of different compounds.
Metallic Bonding
Allows metals to conduct heat and electricity.
Gives metals strength and durability.
Makes metals flexible enough to be shaped into wires and sheets.
Used in buildings, vehicles, electrical wiring, and machinery.