Argon
Argon is a chemical element, number 18 on the periodic table. 

The lifeform named Sluggo, taken aboard  in 2151, came from a planet with an argon-rich atmosphere. To help him survive aboard the ship, an argon lamp was positioned close to Sluggo. ()

In 2267, the  crash landed on Taurus II. The crew found the atmosphere breathable, an oxygen-nitrogen mixture, with traces of argon, neon, and krypton, not dissimilar to that of Earth. ()

The same year, the atmosphere of Gamma Canaris N also was determined to be oxygen-nitrogen, with traces of krypton, argon and neon. ()

The Azure Nebula, a class 11 nebula, was composed primarily of oxygen and argon, with other compounds. ()

Larger quantities of argon were found in atmospheres of class H planets or moons. () Class L planets also had high quantities of argon in their atmospheres. ()

The destruction of the Caretaker's array in 2371 left vapor composed of hydrogen, helium, , and argon. ()

The planet Ahmedeen had seas of liquid argon. ()

A class T nebula encountered by the  in 2376 was composed of hydrogen, helium, and argon. ()

See also 
 Dentium

External link 
 

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Elements