Chemistry
What is the third most abundant gas in the earth's atmosphere?
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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What is the second-most abundant element in the universe, though it is much less common on Earth?
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What noble gas has the lowest melting and boiling points of all the elements?
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What element forms about 78% of Earth's atmosphere by volume?
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What are substances that control the rates of chemical reactions?
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What is the only metallic element that is liquid at standard conditions for temperature and pressure?
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