Chemistry

How many elements in the actinide series are not radioactive?

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Compounds of what element are used in soaps, fertilizers, explosives, and matches?
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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 is the fourth most abundant element in the universe by mass?
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What is the most commonly encountered form of silver?
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What is the symbol used on the periodic table for the element Aluminum?
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Which is true of pericyclic reactions?
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