Chemistry
What is the symbol used on the periodic table for the element Protactinium?
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What actinide was once used to power pacemaker batteries, but has since been replaced?
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Sodium on the periodic table is noted by which symbol?
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What is the breakdown of a material by separation of the layers of which it is composed called?
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What process causes molecules to move into areas that have fewer molecules?
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What word is used to describe crops and foodstuffs grown without chemicals?
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Neptunium on the periodic table is noted by which symbol?
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