Sulfur is the element which has been known since the prehistoric times. It naturally exists in the earth crust (about 0.01 %). It occurs in nature both in free state and in combined state. It is the second member of Group 6 A of the periodic table and it is a non-metallic element. The atomic number and atomic mass of sulfur are 16 and 32 respectively. The color of sulfur is yellow and it is insoluble in water but soluble in carbon sulphide. It is a poor conductor of heat and electricity and it is widely used in making explosive materials.
