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Description:
Third noble gas. Argon represents only 1% of the atmosphere. Very stable, it is used in lightbulbs to prevent the oxydation on the electrical filament. Its light emits a purple color. Twilight enjoys doing experiments with this gas as the light sparkles in her coat color.
It's still the third most common gas in Earth's atmosphere by a huge margin.
After nitrogen, oxygen and argon, all of the remaining gases combined make up less than 0.05% of atmosphere.
Edited