Chemistry
Praseodymium on the periodic table is noted by which symbol?
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What is the most common chemical element found in the Earth's atmosphere?
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What contain most of the calcium ion in the human body?
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What element forms a brilliant mirror when it is painted on glass?
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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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What term is used for military use of harmful biological agents?
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What are the two alkalines to be found in the kitchen?
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What are vast amounts of oil that have become trapped in one place called?
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