Chemistry
What group of elements include lithium, sodium, potassium, rubidium, cesium, and francium?
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Heavy water contains what isotopic form of hydrogen?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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What element in a liquid state is used in the cryogenic cooling of devices and materials?
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What element is the basis for organic chemistry, as it occurs in all living organisms?
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