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How much of Earth’s atmosphere is argon?
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noble gas
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Argon constitutes 0.934 percent of Earth’s atmosphere by volume and 1.288 percent by weight.1
It is the most abundant of the noble gases found on Earth, a result of its unique geochemical history as a radiogenic product of potassium-40 decay. While it is relatively common terrestrially, it is much less abundant in the universe compared to other noble gases like helium and neon.12