Ytterbium (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The most common isotope of ytterbium has 70 protons and 104 neutrons in the nucleus. Credit LBNL Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.