The orbital diagram for sulfur has seven boxes with two arrows pointing in opposite directions and two boxes with one arrow pointing up in each. The arrows represent the 16 electrons of the sulfur atom, and the directions represent their spins. The boxes represent sulfur's orbitals.
Sulfur's electron configuration is 1s22s22p63s23p4. An orbital diagram illustrates how the electrons pair off in each orbital. Electrons are first placed in lower energy levels before the higher energy levels. Hund's Rule states that one electron must be placed in each orbital of a particular energy level before a second electron is placed in the same orbital.