Chemistry
What major chemical other than chlorine is used to purify water of microorganisms?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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A unit of measure of absorbed radiation is known as what?
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What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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The first element on the periodic table of elements with an atomic number of 1 is?
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