Chemistry

Which of these is an element?

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How many structural isomers does propane have?
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Neptunium on the periodic table is noted by which symbol?
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Which of the following is a metal?
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What energy is stored in the form of chemical compounds?
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Which three gas laws constitute the combined gas law (PV/T=pv/t)?
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What type of property does the water cycle show?
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What is the common element in the metal alloys bronze and brass?
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What contain most of the calcium ion in the human body?
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