Ions - Class IX

Ions:

Atoms of several elements exists in the form of ion. Atoms or molecule with negative or positive charge over them are called ions.

Example: Sodium ion (Na+), Potassium ion (K+), Chloride ion (Cl–), Fluoride ion (F–), etc.

Cations:Ions having positive charge over them are called cations. 

Example: Sodium ion (Na+), Potassium ion (K+), Hydrogen ion (H+), etc.

Anions:Ions having negative charge over them are called anions.

Example: Chloride ion (Cl–), Fluoride ion (F–), Carbonate ion (CO3– –), etc.

Monoatomic ions:Ions formed by one atom are called monoatomic ions.

Example: Sodium ion (Na+), Potassium ion (K+), Chloride ion (Cl–), Fluoride ion (F–), etc.

Polyatomic ions:Ions formed by two or more atoms are called polyatomic ions.

Example: Hydroxide ion (OH–), Ammonium ion (NH4+), Carbonate ion (CO3– –), etc.