Isotopes are atoms of the same element.

Isobars are atoms of different elements.

They have the same atomic number but different mass number.

They have different atomic numbers but same mass numbers.

Number of protons and electrons in isotopes are the same .

Number of protons and electrons in isobars is different .

They have the same chemical properties.

They have different chemical properties.

Example: Isotopes of Hydrogen - Protium, Deuterium, Tritium

Example: Isobars - Carbon and Argon.


  1. Class 9
  2. Chapter 4 Class 9 - Structure of Atom (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