Five fascinating facts about argon include: (1) It is the third most abundant gas in Earth's atmosphere, making up nearly 1% of dry air. (2) Its name comes from the Greek word argos, meaning "lazy" or "inactive," due to its chemical inertness. (3) It was the first noble gas ever discovered on Earth. (4) It glows a pale violet or lilac color when subjected to a high-voltage electrical discharge. (5) It is continuously replenished in the atmosphere through the radioactive decay of potassium-40 in Earth's crust.
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