Cyclic allotropes of sulfur containing up to 20 sulfur atoms have been isolated

Question

Cyclic allotropes of sulfur containing up to 20 sulfur atoms have been isolated and characterized. Propose a reason why the bond angles in Sn (where n = 10, 12, 18, and 20) are all close to 106 degree. The bond angles in all sulfur compounds are always 106 degree. Bond angle depends on the hybridization, which is the same for all of the allotropes of sulfur. Rings with an even number of atoms always have 106 degree bond angles. The expanded octet of sulfur creates a bond angle slightly lower than the normal tetrahedral bond angle.

Explanation / Answer

The expanded octet of sulphur creates bond angle 106o

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