Argon
From Halopedia, the Halo wiki
"HERESY! REMOVE THIS FILTH!" This page, "Argon", has been nominated for deletion. The reason given was: Article is about an element present in Earth's atmosphere, not Halo. If you disagree, state your reasoning on its talk page.
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Argon (pronounced /ˈɑrgɒn/) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic table (noble gases). Argon is present in the Earth's atmosphere at 0.93%, making it the most abundant noble gas on Earth. Its full outer shell makes argon stable and resistant to bonding with other elements.
A significant number of inhabited planets in the Orion Arm have Argon present in their atmospheres, including Earth.
