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Element represented by letter A is sulphur and its actual symbol is S. Its atomic number is 16 and has electron arrangement of 2.8.6. It belongs to period 3 and group (VI) of the periodic table. Sulphur exhibits allotropy. The two crystalline allotropes of sulphur are rhombic 1(b) and monoclinic 1(c). Another element that has allotropes is carbon. The allotropes of carbon are diamond and graphite. The yellow balls in each  allotrope are sulphur atoms. In each of the allotropes above it consist of two molecules Each sulphur molecule consists of 8 atoms in a puckered ring.