How many neutrons does sulfur 25 have?

Sulfur-25 has a total of 25 nucleons, which include both protons and neutrons. Sulfur has an atomic number of 16, meaning it has 16 protons. To find the number of neutrons, subtract the number of protons from the total nucleons: 25 - 16 = 9. Therefore, sulfur-25 has 9 neutrons.