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Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 Amu

User Alno
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Mass number = number of neutrons + number of protons

In a periodic table, or other tables, you find that the atomic number of sulfur is 16. That means it has 16 protons.

Then the number of neutrons = 34 - 16 = 18.
User Leoj
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