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Neon is an element which was gaseous under standard conditions. It could be used in neon signs.

The atmosphere of Prospect VII was 0.3% neon. (SNW: "Lift Us Where Suffering Cannot Reach")

The atmosphere of Rigel VII contained trace amounts of neon. (SNW: "Among the Lotus Eaters")

The atmosphere of Finibus III contained trace amounts of neon. (SNW: "Memento Mori")

The atmosphere of Valeo Beta V also contained trace amounts of neon. (SNW: "All Those Who Wander")

In 2267, the Galileo crash landed on Taurus II. Doctor Leonard McCoy considered the planet's atmosphere breathable, which was an oxygen-nitrogen mixture, with acceptable quantities of neon, argon, and krypton. (TOS: "The Galileo Seven")

Later that year, the Galileo was forced to land on a Gamma Canaris N. The crew found the atmosphere to also be an oxygen-nitrogen compound very similar to that of Earth, again containing trace amounts of neon, argon, and krypton. (TOS: "Metamorphosis")

In 2365, the atmosphere of Theta VIII consisted of 14% liquid neon. (TNG: "The Royale")

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