Sulfur

Sulfur is a bright yellow solid.

It is very common on Earth. It is also found in space.

Some sulfur can be found near volcanoes. It can even be found on Mars.

This yellow stuff can smell funny. It can smell like rotten eggs. It can also smell like garlic.

All living things need sulfur to live. It helps make your hair and skin strong.

Sulfur can also make a blue flame. It turns into a red liquid when burned. It is a very busy part of our world.

Sulfur is a bright yellow solid.

It is a very common element. It is the tenth most common element in the universe. It is also the fifth most common on Earth.

In space, sulfur is made inside massive stars. It forms when silicon and helium fuse together. On Earth, you can find sulfur near volcanoes. It is also found on the moon Io. This moon has many active volcanoes.

In 2024, a rover found sulfur on Mars too.

Sulfur is very important for life. It helps make your hair, skin, and feathers strong.

It is also part of some vitamins. Many sulfur parts have a strong smell. Some smell like garlic. Others smell like rotten eggs.

People use sulfur in many ways. It is used to make matches and bug spray. It is also used to make fertilizer. Most sulfur comes from cleaning natural gas and oil.

Sulfur is a fascinating chemical element found all over our universe.

It is the tenth most common element by mass in space. On our own planet, it is the fifth most common element. In its pure form, sulfur looks like a bright, lemon-yellow solid.

When you burn it, the sulfur melts into a deep red liquid. It even produces a bright blue flame while it burns. This element is vital for many things we see every day.

At a tiny level, sulfur atoms like to group together in special shapes.

Most of the time, eight sulfur atoms form a ring called octasulfur. This ring shape is a specific type of molecule. Sulfur can also form long chains called polymers. If you cool melted sulfur very quickly, it becomes a stretchy, brownish substance. This is called plastic sulfur, and it feels like crude rubber. It eventually changes back into a hard crystal after a few days.

People have known about sulfur for a very long time.

In ancient times, people in India, Greece, China, and Egypt used it. In old books, it is often called brimstone. This name means "burning stone." Today, we get most of our sulfur as a byproduct. We find it when we remove contaminants from natural gas and petroleum.

This helps us turn waste into something useful.

Sulfur is used in many different ways in our world.

Its biggest use is making sulfuric acid. This acid helps create fertilizers for plants. Sulfur is also used to make matches and insecticides to protect crops. You can even find it in some medicines. Some sulfur compounds have very strong smells. For example, hydrogen sulfide smells like rotten eggs. Other sulfur parts create the scent of garlic or grapefruit.

Life itself could not exist without this special element.

Sulfur is an essential part of all living things. It is found in important vitamins like biotin and thiamine. It also helps build proteins called amino acids. In your body, sulfur helps make your hair, skin, and feathers strong. These parts use special bonds called disulfides to stay tough. Without sulfur, the building blocks of life would not work correctly.

Sulfur is a versatile chemical element with the symbol S and atomic number 16.

It is an abundant, nonmetallic, and multivalent element. In the vastness of space, sulfur ranks as the tenth most abundant element by mass. On Earth, it is even more common, ranking as the fifth most abundant element. It is an essential macronutrient for all living organisms. Without sulfur, the biochemical functions required for life could not occur.

At the molecular level, sulfur atoms typically form cyclic molecules. The most common form is octasulfur, which is a ring of eight atoms known as cyclo-S8.

This molecule has a specific structure called a D4d point group. When sulfur is in its solid state at room temperature, it is a bright lemon-yellow crystalline substance. As temperature changes, sulfur undergoes several physical transformations. When heated, it melts into a blood-red liquid. If it is burned, it produces a distinct blue flame. Between its melting and boiling points, the substance changes its allotrope, or its physical form. It transitions from beta-octasulfur to gamma-sulfur. This change increases the liquid's viscosity, which is its thickness, because long polymer chains form. At even higher temperatures, these chains break apart through a process called depolymerization.

Sulfur is famous for having many different physical forms, called allotropes. In fact, it forms over 30 different solid allotropes, which is more than any other element. Besides the standard S8 ring, other rings like S7, S6, S12, and S18 exist. A unique form called plastic sulfur can be created by cooling molten sulfur very rapidly. For example, pouring molten sulfur into cold water creates this amorphous, brownish substance. It has a helical structure and feels elastic, much like crude rubber. However, this form is metastable, meaning it is not permanent. Over hours or days, it gradually reverts to a hard, crystalline state.

Humans have interacted with sulfur since ancient history. It was used in ancient India, China, Greece, and Egypt. In historical literature, it was often called brimstone, which translates to "burning stone." While it can be found in its pure, native form, most modern sulfur is a byproduct. We obtain it by removing sulfur-containing contaminants from petroleum and natural gas.

This industrial process provides the massive amounts needed for global commerce.

Today, the most significant commercial use of sulfur is the production of sulfuric acid. This acid is vital for making phosphate and sulfate fertilizers. Sulfur is also used in the manufacturing of matches, insecticides, and fungicides.

Many sulfur compounds are known for their strong odors. For instance, hydrogen sulfide is responsible for the smell of rotting eggs. Other organosulfur compounds create the scents of garlic, grapefruit, and even skunk spray.

Sulfur plays a fundamental role in the biology of all living things. It is a key component of several amino acids, such as cysteine and methionine. These are the building blocks used to create proteins. Two essential vitamins, biotin and thiamine, also contain sulfur. In the human body, sulfur provides mechanical strength to proteins like keratin.

Keratin is the protein found in your hair, skin, and feathers. It stays strong and insoluble because of special chemical links called disulfide bonds (S–S bonds).

Scientists also use sulfur to understand the history of our planet and the universe. Sulfur has 23 known isotopes, including four stable ones: 32S, 33S, 34S, and 36S. The most common, 32S, is created in exploding stars through the alpha process. By measuring the ratio of these isotopes, researchers can determine the chemical history of rocks. They can estimate the temperature of ancient environments or identify the activity of bacteria in old sediments. This helps us understand the redox conditions, or oxygen levels, of ancient oceans. Even in space, sulfur is a major player. It creates the bright yellow and orange colors seen on Jupiter's moon, Io.

Recently, in July 2024, the Curiosity rover discovered elemental sulfur crystals inside a rock on Mars.