Here's why:

* Sulfur's Atomic Number: Sulfur has an atomic number of 16, meaning it has 16 protons and 16 electrons.

* Electron Configuration: The electron configuration of sulfur is 2-8-6. This means it has 6 electrons in its outermost energy level (valence electrons).

* Electron-Dot Diagram: In an electron-dot diagram, each dot represents a valence electron. So, sulfur's electron-dot diagram will have six dots representing its six valence electrons.