Chemistry
Which element has Na as its chemical symbol?
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High levels of what chemical may be in trailers provided for people displaced by Hurricane Katrina?
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What symbol appears on the periodic table for the element with the atomic number 18?
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Clocks made out of what alkali metal are considered the most accurate of all clocks?
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In 2013, 140 countries signed the Minamata Treaty to protect people from what chemical element?
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Which two transition metals do not exhibit diamagnetism?
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