Showing results for 
Search instead for 
Did you mean: 
New Contributor

Atomic Mass greater than Mass Number?

How can an isotope have greater atomic mass than mass number if mass defect indicates that mass should be lost and not gained? For example, U-235 has an atomic mass of approximately 235.0439299 u. Based on my understanding of mass defect, shouldn't it have an atomic mass that is less than 235 u? Thanks

0 Kudos