Chemistry

Which of the following is a compound?

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What is the most common chemical element found in the Earth's atmosphere?
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Who performed the infamous gold-foil experiment that first detected the existence of the atomic nucleus?
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What are chemicals that reduce or prevent oxidation called?
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What is the breakdown of a material by separation of the layers of which it is composed called?
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All of the halogens form acids when bonded to what element?
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What metal is used in airplanes for its lightweight properties?
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