Chemistry
What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?
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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 symbol appears on the periodic table for the element with the atomic number 66?
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High levels of what chemical may be in trailers provided for people displaced by Hurricane Katrina?
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Which of these helps determine what state of matter a substance is in?
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