Chemistry

Which noble gas has "A" as its first letter?

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What major chemical other than chlorine is used to purify water of microorganisms?
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The study of composition and properties of substances and matter is called?
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Which electron that would emit the greatest amount of energy by dropping electron levels?
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What volume does 24 grams of ammonia gas occupy at standard temperature and pressure?
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What unit of measurement is one-thousandth of a gram?
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What is the symbol used on the periodic table for the element Boron?
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What is the symbol used on the periodic table for the element Francium?
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What precious metal is most commonly used in catalytic converters for cars?
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