The mass number of an isotope of uranium is 238, and its atomic number is 92. Which symbol best represents this isotope of uranium?

Uranium with an atomic mass number of 238 indicates that it is highly unstable and radioactive. This is because its original number of neutrons is only 92, giving it 146 more neutrons than the usual. These isotopes are usually given symbols denoted by the element-"atomic mass". This means a symbol for this isotope is Uranium-238 or ^238U.