Chemistry
What element has an atomic number of 40?
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What is the unit defined as the energy needed to raise one gram of water by 1 degree Celsius?
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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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Gold, silver, lead, and copper exhibit the properties of which of the following crystal systems?
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What compound found in tap water is good for the teeth?
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