After the fall of Rome in the middle ages, Christianity split into two groups the western and the Eastern Church. The Roman Catholic Church's missionaries spread Christianity in western parts of Europe in the middle ages. In the Eastern part of Europe, the Byzantine Empire came into power, spread Christianity and built Church Hagia Sophia.
A proton is a subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
A nucleus is located in the central region of the cell.
