Chemistry
Europium on the periodic table is noted by which symbol?
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What radioactive metallic element, found in all uranium ores, has an atomic number of 89?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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How are neutrons and protons held together in a nucleus?
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What halogen is extremely rare and is considered one of the rarest naturally occurring elements on Earth?
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Which Middle Eastern country was widely accused of using chemical weapons in 2013?
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