It was first recognized as an element in 1777 by A. L. Lavoisier. Properties and Compounds Sulfur is found in group VIa of the periodic table . It exhibits allotropy . Solid sulfur occurs principally in three forms, all of which are brittle, yellow in color, odorless, tasteless, and insoluble in water.
Amorphous sulfur is a dark, noncrystalline, gumlike substance.
It slowly reverts to the rhombic form on standing. The crystalline forms are readily soluble in carbon disulfide, but the amorphous form is not. Many other forms of sulfur exist. Liquid sulfur is unusual in that its viscosity increases as it is heated. This property is thought to be due to the formation of long polymeric chains of sulfur molecules.