According to the Encyclopedia Britannica, sulfur is a chemical element from the periodic table and thus is not made of any other elements. However, like the other periodic-table elements, a sulfur atom is made up of protons, neutrons and electrons.
Sulfur is chemically similar to oxygen and is a highly reactive element that has the designated atomic number 16, which means it has 16 protons and 16 electrons. The number of neutrons can vary, creating different isotopes. The most common configuration contains 16 neutrons. This isotope is known as S-32 and occurs in nature 95.02 percent of the time, according to data from About.com.