Chemistry
What is the sixth most abundant element on Earth, as well as the most abundant alkali metal?
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What is added to drinking water and to swimming pools to serve as a disinfectant?
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What symbol appears on the periodic table for the element with the atomic number 10?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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What symbol appears on the periodic table for the element with the atomic number 62?
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What symbol appears on the periodic table for the element with the atomic number 22?
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