Iron has a mass number of 56 and is one of the most stable of all the elements. We say that iron has a high binding energy per nucleon. Elements with lower and higher mass numbers per nucleon are ...

They have a radius of around 1 × 10 10 metres ... the relative mass of an atom is the same as its nucleon (mass) number. Neutrons have no charge. Protons are positively charged.

Understanding the origin of the nucleon mass is one of the major scientific goals of the Electron-Ion Collider (EIC). Scientists also want to understand how the mass from quarks and gluons is ...