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Octasulfur

physical science Maturity 9-11 Next article →

Octasulfur is a very important yellow solid. It has no smell and no taste. This substance is a major chemical used in industry. It is the most common allotrope of sulfur. An allotrope is just a different form of the same element. You can find this substance widely in nature.

This substance works by joining atoms into rings. Each ring contains exactly eight sulfur atoms. These atoms form a shape called a crown conformation. The bonds between the atoms are all equal. They measure about 2.05 Å in length. This ring shape is part of its structure.

Scientists study many different forms of this sulfur. There are four main types called α, β, γ, and λ. The liquid form is known as λ-sulfur. You can make γ-sulfur by quenching the liquid. Quenching means cooling it down very quickly. If you cool it slowly, it becomes β-sulfur.

We find octasulfur in many specific places. It makes up 99% of elemental sulfur. People get it from volcanic sources. It is also made by the Claus process in petroleum refineries. It can even be found in outer space. Scientists found it in samples from the asteroid Ryugu.

Octasulfur can grow into large, beautiful crystals. These crystals are yellow and somewhat translucent. Translucent means they let some light through. They can also take on different crystal shapes. Two are stable at standard conditions. One shape is called rhombohedral. This is the accepted standard state for the substance.

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