Cesium to Bismuth
With the completion of the loops the positive charge has built to the point that some relief is needed from the building positive charge, so the next layer on each end of the nucleus forms with protons located only in an extension of the core. There are no protons located in the outer loops where they would normally also be found. There are only neutrons in their expected locations in these outer loops. These gaps or lack of protons in these outer loops results in The Voids structural stages of the nucleus. The Voids stage is complete with the nucleus of bismuth209.