Chemistry

Neptunium on the periodic table is noted by which symbol?

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What happens to water when it freezes?
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What element forms a brilliant mirror when it is painted on glass?
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What is the diffusion of water through a cell membrane called?
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Most metals are gray in color; what is the only metal that is yellow?
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What element was discovered as a component of the debris of the first hydrogen bomb explosion?
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What are chemicals that reduce or prevent oxidation called?
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What are organic compounds in which some of the bonding elements are delocalized?
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What is the half-life of Rubidium-Strontium 87?
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