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Atoms and Molecules

Tutormate > CBSE Syllabus-Class 9th Chemistry > Atoms and Molecules

06 Ions

  • A positively or negatively charged atom or group of atoms is called an ion.
    • Cation: A Positively Charged Ion is known as Cation.
    • Anion: A Negatively Charged Ion is known as Anion.

SOME COMMON IONS

Name of ion Symbol

(or Formula)

 Name of

Ion

 Symbol

(or Formula)
1. Sodium ion  

Na+

 

 10. Chloride ion  

Cl–

 
2. Potassium ion  

K+

 

 11. Bromide ion  

Br–

 
3. Ammonium ion  

NH4+

 

 12. Hydroxide ion  

OH–

 
4. Magnesium ion  

Mg2+

 

 13. Nitrate ion  

NO3–

 
5. Calcium ion  

Ca2+

 

 14. Oxide ion  

O2–

 
6. Copper (II) ion  

Cu2+

 

 15. Sulphide ion  

S2–

 
7. Zinc ion  

Zn2+

 

 16. Carbonate ion  

CO32–

 
8. Iron (II) ion  

Fe2+

 

 17. Sulphate ion  

SO42–

 
9. Aluminium ion  

Al3+

 

 18. Phosphate ion  

PO43–

 

IONIC COMPOUNDS:

The compounds which are made up of ions are known as ionic compounds.

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Properties of matter

Laws of chemical combination

Dalton’s atomic theory

Symbols of elements

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Writing chemical formulae of common compounds

Mole concept

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