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Noble Gases: Definition, List & Properties

Instructor: Derrick Arrington

Derrick has taught biology and chemistry at both the high school and college level. He has a master's degree in science education.

Elements are grouped on the periodic table based on their chemical properties. In this lesson you will learn about a group of elements known as the noble gases and their unique properties.

We also recommend watching The Kinetic Molecular Theory: Properties of Gases and Pressure: Definition, Units, and Conversions

Definition of Noble Gases

The periodic table is divided into 18 vertical columns referred to as groups or families. On the far right side of the periodic table in group 18 is a unique group of elements known as the noble gases. The noble gases are a group of extremely nonreactive elements that all exist in the gas state.

They are often considered to be inert. Inertness refers to an element's tendency to resist change and reactions. For this reason, the noble gases were discovered later than many other elements. Scientists did not notice them because they were never found reacting with other elements in nature or in the lab.

The noble gases are on the right side of the periodic table. They have been surrounded by a red box in this image.
An image of the periodic table.

List of Noble Gases

The noble gases include helium, neon, argon, krypton, xenon, and radon.

  • Helium - This gas has the atomic number two and is the second most abundant element in the universe. It is a main part of most stars.
  • Neon - Neon has the atomic number ten and is commonly used in lamps for the red-orange glow it gives off when exposed to electricity.
  • Argon - Argon has the atomic number 18. It is most commonly used in welding as an inert gas to reduce the risk of fire and in lighting.
  • Krypton - This gas has atomic number 36 on the periodic table and is most commonly used in photography and lighting.
  • Xenon - Xenon has atomic number 54. It is most commonly used in lamps and has been used as an anesthetic.
  • Radon - Radon is atomic number 86. It is formed by the radioactive decay of other elements and leeches up to the surface of Earth as it is formed. It is known to cause lung cancer when breathed in by those who encounter the gas on a regular basis.

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