Chemistry
What symbol appears on the periodic table for the element with the atomic number 18?
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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 name for naturally-occurring alloy of gold and silver with a small amount of other metals?
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What number is also the same as proton number and the number of electrons of a neutral atom?
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What volume does 24 grams of ammonia gas occupy at standard temperature and pressure?
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What element was known in ancient times and referred to in Genesis as "brimstone"?
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