Chemistry
What symbol appears on the periodic table for Calcium which has the atomic number 20?
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What is the stinky gas associated with swamps and anaerobic decomposition?
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What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?
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Neptunium on the periodic table is noted by which symbol?
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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 was discovered as a component of the debris of the first hydrogen bomb explosion?
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What is the symbol used on the periodic table for the element Scandium?
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What radioactive metallic element, found in all uranium ores, has an atomic number of 89?
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