* Atomic Number: Sulfur's atomic number is 16. This means a neutral sulfur atom has 16 protons.
* Neutrality: In a neutral atom, the number of protons (positive charge) equals the number of electrons (negative charge).
* Isotopes: The number "33" in sulfur-33 refers to its mass number (protons + neutrons). The mass number doesn't affect the number of electrons in a neutral atom.
Therefore, sulfur-33 has 16 electrons.
