The element found in nature with the highest atomic number is uranium, which has an atomic number of 92. Uranium is a naturally occurring element and is relatively abundant in the Earth's crust. It is a radioactive element and is commonly used as a fuel in nuclear reactors. Uranium is known for its various isotopes, with uranium-238 being the most common isotope found in nature. There are a few synthetic elements with higher atomic numbers than uranium, but they are not found naturally and are created through nuclear reactions in laboratories.