Here's why:
* Electronic Configuration: Sulfur's electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁴.
* Outermost Shell: The outermost shell is the third shell (n=3), which contains the 3s and 3p orbitals.
* Outer-Shell Electrons: The 3s orbital holds 2 electrons, and the 3p orbital holds 4 electrons, totaling 6 outer-shell electrons.
