Here's why:

* Atomic Number: Sulfur (S) has an atomic number of 16, meaning every sulfur atom has 16 protons.

* Mass Number: The mass number represents the total number of protons and neutrons in an atom's nucleus.

* Sulfur-32: Has a mass number of 32, meaning it has 16 protons (atomic number) and 16 neutrons (32 - 16 = 16).

* Sulfur-34: Has a mass number of 34, meaning it has 16 protons (atomic number) and 18 neutrons (34 - 16 = 18).

Therefore, sulfur-34 has 2 more neutrons than sulfur-32.