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Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
Chemistry
What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
Radon
Neon
Argon
Xenon
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What is the second most common metal on Earth, and the most widely-used metal?
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Which is true of pericyclic reactions?
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What symbol appears on the periodic table for the element with the atomic number 106?
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Which of these items will float in a glass of water?
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Phosphorus and sulfur are the ingredients in what?
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Actinium on the periodic table is noted by which symbol?
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What are compounds that contain carbon called?
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What is another name for synthetic gas made from coal?
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