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

In isotope notation, the mass number goes at the upper left of the element symbol, and the atomic number goes at the lower left. Uranium has the symbol U, so this isotope is written ²³⁸₉₂U. That matches choice A, with 238 above 92 beside U.

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