* Sulfur's Electron Configuration: Sulfur (S) has an atomic number of 16, meaning it has 16 protons and 16 electrons. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁴.
* Outermost Shell: The outermost shell is the third shell (n=3), which contains the 3s and 3p sublevels.
* Filling the Outer Shell: The 3s sublevel holds a maximum of 2 electrons, and the 3p sublevel holds a maximum of 6 electrons. To be completely filled, the 3p sublevel needs 2 more electrons (3p⁶).
Therefore, sulfur needs 2 more electrons to fill its outer shell.
