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The mass number indicates the number of protons AND neutrons in the nucleus. Since the number of neutrons can vary, so can the mass number. The different versions of elements based on the number of neutrons are called isotopes.

Sulfur-35 has an Atomic Mass of 35. So, it has a total of 35 protons and neutrons in the nucleus. Since sulfur always has 16 protons, then the number of neutrons in this isotope is 19. (35 - 16 = 19)

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13y ago

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