What elements have an atomic mass of less than 10?

Elements with an Atomic Mass of less than 10 include hydrogen (1.008), helium (4.0026), lithium (6.94), beryllium (9.0122), and boron (10.81). Among these, hydrogen, helium, lithium, and beryllium all have atomic masses below 10, while boron is just above. These elements are primarily found in the first two rows of the Periodic Table.