A, according to the information in the cell, the symbol of uranium element is U, so the statement is correct;

B, by the name of uranium element, uranium element belongs to the metal element, so the statement is correct;

C. According to the data, the atomic number of uranium element is 92, and according to the number of protons in the nucleus such as the atomic number in the atom, the number of protons is 92, so the statement is correct;

D. According to the data, the number below the element symbol is the relative atomic mass of the atom, not the actual mass, so the relative atomic mass of uranium atom is 235, and the actual mass of uranium atom is not 235g, so the statement is wrong.

So choose D.