Chemistry

What is the sixth most abundant element on Earth, as well as the most abundant alkali metal?

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Which Middle Eastern country was widely accused of using chemical weapons in 2013?
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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What compounds that are soluble in water are classed as bases?
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Neptunium on the periodic table is noted by which symbol?
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What is the molecular geometry of the molecule sulfur hexafluoride?
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Which of these is an element?
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Which suicidal 19th century chemist has the single line etched on his tombstone "S=k log W"?
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