Chemistry
What is the symbol used on the periodic table for the element Promethium?
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What word is used to describe crops and foodstuffs grown without chemicals?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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How are neutrons and protons held together in a nucleus?
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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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High levels of what chemical may be in trailers provided for people displaced by Hurricane Katrina?
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The Statue of Liberty is made of an iron frame with a sheet of what other metal hung over it?
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Which of the following subshells has the highest energy?
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