4.3.2 Isotopes
1. Isotopes are atoms of certain elements which have the same number of protons but different number of neutrons in the nucleus of the atoms.
![](http://spmscience.blog.onlinetuition.com.my/wp-content/uploads/sites/10/2017/08/Picture8-1-300x174.png)
2. Isotopes of the same element have same chemical properties. For example, both carbon-12 and carbon-13 burn in oxygen to form carbon dioxide.
3. Physical properties of isotopes are different. For example, carbon-14 isotope has a melting point, boiling point and density that are higher than those of carbon-12 and carbon-13.
Examples of isotopes
![](http://spmscience.blog.onlinetuition.com.my/wp-content/uploads/sites/10/2017/08/Picture9-1.png)