Chemistry
What is the spontaneous decay of atomic nuclei known as?
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What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What is the most abundant halogen found in the Earth's crust?
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An atom of which of the following elements has the smallest volume?
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Actinium on the periodic table is noted by which symbol?
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Most metals are gray in color; what is the only metal that is yellow?
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The red color of rubies is caused mainly by the presence of what element?
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What is the approximate heat of vaporization of water at its boiling point?
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What is a compound or mixture of chemical compounds that is used to maintain a steady pH?
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