The difference between the mass of an isotope and its mass number is called the mass defect.
What is mass defect?
The difference between the expected and actual mass of an atom's nucleus is known as a mass defect. This discrepancy is due to the binding energy of a system manifesting as more mass.
A number stated in atomic mass units is the best example of the mass defect.
Therefore, the mass defect is the difference between the mass of the isotope and its number.
Learn more about the mass defect, refer to:
https://brainly.com/question/11624098
