Some Important Metals

                                Some Important Metals

 Nonmetal Sulfur (Sulfur)

                        Atomic number 16, Atomic weight 32, Electronic structure 1s²2s²2p⁶3s²3p⁴. valency +2, +4 and +6 and 2 in some compounds.

                        Sulfur has been known since ancient time. Sulfur come out with lava when the volcano bursts. Sulfur compounds are found in many springs and wells / stepwells.

                         Ancient Indian physicians used sulfur make various medicines. The properties of copper are destroyed when heated with sulfur.

                         A scientist named Lavoisier called is an element based on the study of its properties. Sulfur is found in free from in nature and various compounds.

                             Sulfur Allotropy

       Allotropism-

                             Two or more forms of an element that exhibit differences in structure and other physical properties from each other but possess similar chemical properties are called as allotropes of that element. This properties of elements is called allotroopism. 

                                     

                                       Crystalline sulfur

(i)          Rhombic Sulfur-

                              This form of sulfur is also known as alpha sulfur. This form sulfur is very stable at normal temperatures. It is insoluble in water but soluble in carbon disulfide. On heating it at 368.6 K (95.6' C), it is converted into another unconformable, monoclinic sulfur.

 (ii.)      Mono-clinic Sulfur-

                               This is also called beta sulfur. It occurs as a needle-shaped crystal. Therefore, it is also called cone sulfur, it is insoluble in the water and soluble in carbon disulfide. This alkali of sulfur is stable at temperatures above 368.6 K. At low temperatures, it converts to (alpha) sulfur. Both forms of sulfur coexist at 368.6 K. This temperatures is called transition temperature.

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