| Name: | Argon |
| Symbol: | Ar |
| Atomic number: | 18 |
Argon is a chemical element, number 18 on the periodic table. Argon is colorless, odorless and inert, is present to a small extent in many atmospheres, and is obtained as a byproduct from the liquefaction and separation of air.
In 2267, the Galileo crash-landed on Taurus II, near the Murasaki 312. The crew found the atmosphere breathable, an oxygen-nitrogen mixture, with traces of argon, neon, and krypton, not dissimilar to that of Earth. (TOS: "The Galileo Seven")
Larger quantaties of argon are found in atmospheres of Class L planets such as Indri VIII and Class H planets or moons (TNG: "The Chase", VOY: "Scorpion, Part II")
The Azure Nebula near Klingon space is a class 11 nebula comprisede primarily of oxygen/argon, with other compounds. (VOY: "Flashback")