Chemistry
What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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Compounds of what element are used in soaps, fertilizers, explosives, and matches?
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What element is used as a filler gas in fluorescent and incandescent light bulbs?
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What is the spontaneous decay of atomic nuclei known as?
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A tincture of iodine solution means that iodine is dissolved in which substance?
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What symbol appears on the periodic table for the element with the atomic number 22?
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