Chemistry
What group of elements include lithium, sodium, potassium, rubidium, cesium, and francium?
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What are vast amounts of oil that have become trapped in one place called?
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Selenium came from the Greek word "selene", which means what word in English?
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What isotope of carbon can be used to figure out how old some objects are or when something died?
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What is the most common chemical element found in the Earth's atmosphere?
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What is an atom that has more electrons than normal referred to as?
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Mendelevium on the periodic table is noted by which symbol?
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