Chemistry
What symbol appears on the periodic table for Thorium which has the atomic number 90?
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What is a substance made from only one type of atom called?
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What symbol appears on the periodic table for the element with the atomic number 66?
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Which element is commonly used in catalytic converters due to its properties as a reducing agent?
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What will happen to a bowl of ice cream left in the sun?
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What is used to remove oxygen from cathode ray tubes and vacuum tubes?
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What extremely flammable gas was associated with the famous explosion of the Hindenburg airship?
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