Chemistry
What element has an atomic number of 40?
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What is the stinky gas associated with swamps and anaerobic decomposition?
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What term is used for military use of harmful biological agents?
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Oxygen can also be created by humans by using what process, where electricity passes through water?
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What is the only metallic element that is liquid at standard conditions for temperature and pressure?
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Silver chloride and silver nitrate are both chemicals that darken with exposure to what?
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What symbol appears on the periodic table for the element with the atomic number 92?
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