Atom contains:

Protons which are Positively charged

Electrons which are Negatively charged

Neutrons which are Neutral


In an atom, the number of protons is equal to the number of electrons .

So the positive and negative charges are balanced out


Ions are formed when atoms lose or gain electrons .


In formation of ions;


  • Cation : When an atom loses an electron

The negative charge reduces .

Thus it becomes positively charged - Cation, because;

The number of positively charged protons becomes more than negatively charged electrons



  • Anion : When atom gains an electron ,

The negative charge increases .

Thus it becomes negatively charged - Anion, because;

The number of negatively charged electrons becomes more than positively charged protons

  1. Class 9
  2. Chapter 3 Class 9 - Atoms And Molecules (Term 2)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo