Chemistry
What symbol appears on the periodic table for Thorium which has the atomic number 90?
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What element was discovered as a component of the debris of the first hydrogen bomb explosion?
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What symbol appears on the periodic table for the element with the atomic number 96?
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A unit of measure of absorbed radiation is known as what?
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What happens to water when it gets close to freezing?
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What are vast amounts of oil that have become trapped in one place called?
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What is the diffusion of water through a cell membrane called?
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