Chemistry
What symbol appears on the periodic table for the element with the atomic number 22?
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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 is the fifth most abundant element in the universe after hydrogen, helium, oxygen and carbon?
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Which of these would be used to measure the volume of liquid in a glass?
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Sodium on the periodic table is noted by which symbol?
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