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The noble gases include helium, neon, argon, krypton, xenon, and radon. 1  Helium has the atomic number two and is the second most abundant element in the universe. 2  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 has the atomic number 18.
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.