Chemistry
What symbol appears on the periodic table for Thorium which has the atomic number 90?
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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 symbol appears on the periodic table for the element with the atomic number 22?
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What process changes a rock's chemical composition to break it down?
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What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?
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If nitrous oxide is added to an engine, what will the effect be?
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Selenium came from the Greek word "selene", which means what word in English?
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In 2013, 140 countries signed the Minamata Treaty to protect people from what chemical element?
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