Atomic Structure Question
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An element has an atomic mass of 355.5 amu. Its isotopes have mass numbers of 355 and 356. Which statement is true about the isotopes of the element?
- The isotope with a mass number of 355 is more abundant.
- The isotope with a mass number of 356 is more abundant.
- The isotopes have an equivalent abundance.
- An isotope with a mass number of 357 is more abundant.