Chemistry
What contain most of the calcium ion in the human body?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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What is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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What is the name of the temperature at which Helium I becomes Helium II?
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The most common commercial use of magnesium metal is as an alloying agent with what other element?
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