Chemistry
What symbol appears on the periodic table for the element with the atomic number 70?
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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 energy is stored in the form of chemical compounds?
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Which type of matter has definite volume but no definite shape?
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Heavy water contains what isotopic form of hydrogen?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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Analysis of the black soot left over from a fire would reveal what primary element?
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