* Oxygen (O): Has an atomic number of 8, meaning it has 8 protons and 8 electrons. Its electron configuration is 2, 6. This means it has two electron shells.

* Sulfur (S): Has an atomic number of 16, meaning it has 16 protons and 16 electrons. Its electron configuration is 2, 8, 6. This means it has three electron shells.

In summary: Sulfur has an additional electron shell compared to oxygen due to having a greater number of electrons.