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Argon makes up 0.93% of the earth's atmosphere, making it the third most abundant gas. First suspected to be present in air by Henry Cavendish in 1785 and isolated by Lord Rayleigh and Sir William Ramsay in 1894. It is the first of the noble gases to be discovered and it is named from a Greek word meaning inactive or lazy

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Q: What gas makes up 0.09 of the atmosphere?
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