Chemistry
What symbol appears on the periodic table for the element with the atomic number 70?
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What metal is used in airplanes for its lightweight properties?
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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 actinide was once used to power pacemaker batteries, but has since been replaced?
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Which of the following is used as a rating scale to grade gasoline?
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What are the products of propanoic acid and ethanol when the two are combined with warm sulphuric acid?
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