Nepedia
Back to Discover
Advanced Reader
⚛️

Magnesium

physical science Maturity 7-9 Next article →

Magnesium is a chemical element with the symbol Mg and the atomic number 12. It is a shiny, gray metal known for having a low density and a low melting point. Magnesium is also highly chemically reactive. This means it interacts easily with other substances. Because it is part of the alkaline earth metals in group 2 of the periodic table, it usually occurs in nature combined with other elements. It almost always maintains an oxidation state of +2.

Mg sheets and ingots
Mg sheets and ingots

The chemical behavior of magnesium is quite unique. When it is exposed to air, it reacts to form a thin layer of magnesium oxide. This layer acts as a passivation coating. This coating is helpful because it prevents further corrosion of the metal. If you burn the pure metal, it produces a brilliant-white light.

Magnesium also reacts with water at room temperature. This reaction produces hydrogen gas and magnesium hydroxide. The process is slower with solid metal but happens much faster with powdered magnesium. If magnesium reacts with steam, it produces magnesium oxide and hydrogen gas instead.

Magnesium Sparks
Magnesium Sparks

Magnesium is often used to create strong and lightweight alloys. In its pure polycrystalline form, the metal is quite brittle. It can easily fracture along shear bands if it is worked too much. However, engineers can make it much more malleable. They do this by adding small amounts of other metals, such as 1% aluminium. Adding calcium can also help reduce flammability in these mixtures.

To prevent corrosion in these alloys, scientists must carefully control the amount of metals like iron or nickel. Adding small amounts of arsenic can even reduce the corrosion rate in salt solutions by nearly ten times.

Humans have developed several ways to produce magnesium metal. One common method is the electrolysis of magnesium salts found in brine. Another major method is the Pidgeon process. In this process, magnesium oxide is heated with a ferrosilicon alloy at very high temperatures. The silicon acts as an oxygen scavenger. This reaction creates gaseous magnesium, which is then condensed and collected.

محتویات درون ریتورت
محتویات درون ریتورت

This method is very popular because it can produce high-purity magnesium. While the United States was a major supplier in the 20th century, China now produces the vast majority of the world's magnesium.

Rotary kiln Johannsen patent US1618204
Rotary kiln Johannsen patent US1618204

Magnesium is incredibly abundant throughout our universe. It is the eighth most abundant element in the Earth's crust. It is also the fourth most common element in the entire Earth, making up 13% of the planet's mass. In the cosmos, magnesium is created inside large, aging stars. These stars add three helium nuclei to a carbon nucleus in a sequential process. When these stars explode as supernovas, they expel magnesium into the interstellar medium. This material can then be recycled into new star systems.

This element is also vital for life on Earth. Magnesium is the eleventh most abundant element by mass in the human body. It is essential to every cell and is required for the function of about 300 enzymes. Magnesium ions interact with important compounds like DNA, RNA, and ATP. Because of these roles, magnesium compounds are used in medicine. For example, milk of magnesia is used as an antacid or laxative.

FoodSourcesOfMagnesium
FoodSourcesOfMagnesium

Other magnesium compounds help stabilize nerve excitation or blood vessel spasms.

Scientists also use magnesium to study the history of our solar system. Magnesium has three stable isotopes. One of these isotopes, magnesium-26, is radioactive. It is a daughter product of the isotope aluminum-26. By studying the ratios of these elements in meteorites, researchers can learn about the early solar nebula. These meteorites contain preserved information from the very beginning of our solar system. This connection shows how a single element can link the life of a star to the biology of a human.

627 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

🖼️ Images & Media (10)
File:Cold rolling of Mg and Mg-1Al-0.1Ca.jpg
Cold rolling of Mg and Mg-1Al-0.1Ca.jpg
File:Mg sheets and ingots.jpg
Mg sheets and ingots.jpg
File:محتویات درون ریتورت.jpg
محتویات درون ریتورت.jpg
File:Rotary kiln Johannsen patent US1618204.png
Rotary kiln Johannsen patent US1618204.png
File:Bundesarchiv Bild 102-12062, Wasserreiter mit Magnesiumfackeln.jpg
Bundesarchiv Bild 102-12062, Wasserreiter...
File:Bugatti Aérolithe AV.jpg
Bugatti Aérolithe AV.jpg
File:Magnesium-products.jpg
Magnesium-products.jpg
File:Magnesium Sparks.jpg
Magnesium Sparks.jpg
File:FoodSourcesOfMagnesium.jpg
FoodSourcesOfMagnesium.jpg
Burning Magnesium Block!.ogv
More to explore

✨ What else?

Related topics you might enjoy

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.