Carbon group

Some things belong in a group. They all have four small parts.

Carbon is in this group. It is in your body! Carbon can be hard like a diamond. It can also be soft like the dark soot in a fire.

Silicon is in this group too. It is in many rocks.

Tin and lead are in this group. They are metals. They can be heavy.

One more part is called flerovium. It is made by people in a lab. It does not stay around for long. These things are all very special.

The carbon group is a family of elements. They live in a specific column on the periodic table. This group includes carbon, silicon, germanium, tin, lead, and flerovium.

All these elements share a special trait. They each have four valence electrons. These are the tiny parts in the outer shell of an atom. Because they have four, they like to bond with others. This helps them reach a full outer shell of eight.

Each member of the group is different. Carbon is very famous. It can be soft like soot or hard like a diamond. It makes up about 22.8% of a human body. Silicon is the second most common element in Earth's crust. It is often found in rocks.

As you move down the group, the atoms get bigger. They also get heavier. Tin and lead are metals. Tin can even turn into a gray powder in the cold. This is called tin pest. Flerovium is a synthetic element. This means people make it in a lab. It is very unstable and disappears quickly.

The carbon group is a special family of elements. You can find them in a single column on the periodic table. This group is often called the tetrels. This name comes from a Greek word meaning four. It describes a very important trait of these elements. Every member of this group has exactly four valence electrons. These are the tiny parts in the outermost shell of an atom.

These four electrons change how the elements work. Most of these elements like to form covalent bonds. A covalent bond is a way atoms stick together by sharing electrons. They often do this to reach a full outer shell of eight electrons. Carbon and silicon are very good at this kind of bonding. As the atoms in the group get larger, they change how they act. They can lose electrons more easily as they grow.

Humans have known about some of these elements for a very long time. People in the ancient world used carbon, tin, and lead. They also knew about sulfur, iron, copper, mercury, silver, and gold. Ancient Egyptians used silicon in the form of rock crystal. They made beautiful beads from it. Most of the other members were found much later. Flerovium is a synthetic element. This means it does not occur in nature and is made in a lab.

Each element in the group has its own unique facts. Carbon is found in 22.8% of a typical human body. Silicon is the second most common element in the Earth's crust. It makes up 28% of the crust. Germanium is much rarer, making up only 2 parts per million of the crust. Tin is the 49th most abundant element in the crust. Lead is the 36th most abundant element. Flerovium is very different because it is radioactive. Its most stable version lasts only 2.6 seconds.

These elements can look and feel very different from one another. Carbon can be soft like soot or hard like a diamond. Silicon and germanium are metalloids, which means they have some metal traits. Tin and lead are true metals. Tin can even change shape in the cold. It can turn into a gray powder called $\alpha$-tin. This happens at temperatures below 13.2 °C. This strange change is known as tin pest.

The carbon group is a vertical column of elements in the periodic table. In modern IUPAC notation, this is known as group 14. Scientists in semiconductor physics often refer to it as group IV. The group is also called the tetrels. This name comes from the Greek word "tetra," meaning four. This name is quite fitting for the group's chemistry. Each element in this family possesses exactly four valence electrons. These valence electrons are located in the outermost shell of the atom.

These four valence electrons drive the chemical behavior of the entire group. Most members, especially carbon and silicon, have a strong tendency toward covalent bonding. A covalent bond occurs when atoms share electrons to reach a stable state. Usually, these elements bond to achieve a full outer shell of eight electrons. This process often involves hybridization. Hybridization is a process where different types of atomic orbitals merge into new shapes. For example, single bonds often use an sp3 arrangement of electrons. Carbon can also form different structures, such as the sp2 pairs found in graphite and graphene.

As you move down the group, the physical and chemical properties change significantly. The elements transition from non-metals to metalloids and finally to metals. Carbon is a non-metal. Silicon and germanium are metalloids, which are elements with properties of both metals and non-metals. Tin and lead are true metals. The final member, flerovium, is a synthetic, radioactive element. It is predicted to be a post-transition metal, though it may show some noble gas-like properties. Flerovium is very unstable, with a half-life of only 1.9 seconds.

Each element also shows different physical characteristics like density and melting points. The boiling points generally decrease as the elements get heavier. Carbon sublimes at a very high 3825 °C. In contrast, lead boils at 1749 °C, and flerovium is predicted to boil at a freezing −60 °C. Atomic radii and densities tend to increase as the atomic number rises. Carbon has a density of 2.26 g·cm⁳, while lead is much denser at 11.3 g·cm⁳. The atomic radius of carbon is 77 picometers, but lead grows to 175 picometers.

Carbon is famous for having many allotropes. An allotrope is a different physical form of the same element. Graphite consists of stacked sheets of carbon. Diamond is a much harder, rarer form. There is also amorphous carbon, which is found in soot. Scientists discovered fullerene, which is shaped like a sphere, and graphene, which is a single honeycomb-shaped layer. Silicon has two forms at room temperature: a brown powder and a gray crystalline version. Tin is even more unusual. It usually exists as silvery $\beta$-tin. However, below 13.2 °C, it can turn into a gray powder called $\alpha$-tin. This process is called tin pest.

Humans have interacted with these elements for thousands of years. Carbon, tin, and lead were well known in the ancient world. Ancient Egyptians used silicon in the form of rock crystal to make beads. Most other elements were discovered much later through science. Some elements, like tin and lead, have magic nuclei. This means they are more stable and common than many other elements. Carbon also has many isotopes, which are different versions of the same element. Carbon-14 is a famous radioactive isotope used to study history because it has a half-life of 5,730 years.

These elements are vital to the Earth and our bodies. Carbon is a key part of life, making up 22.8% of a typical human. It is found in the atmosphere as carbon dioxide and methane. Silicon is the second most abundant element in the Earth's crust at 28%. It is a major part of silicate minerals. Lead is the 36th most abundant element in the crust, but human activity releases more lead into the environment than any other metal. Flerovium is different because it does not occur in nature. It only exists in particle accelerators where scientists create it one atom at a time.