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neutrons arsenic (chemical symbol as, atomic number ) is a notoriously poisonous metalloid . it comes in many allotropic forms, of which the yellow, black, and gray forms are regularly seen. it is sometimes found in its elemental form in nature, but it is usually combined with metals in various minerals
. given its high toxicity and the ease with which it could be used surreptitiously, arsenic was used in history by murderers, including members of the ruling class, to gain wealth, position, and power. it was therefore called the "king of poisons" and the "poison of kings." some arsenic compounds—such...
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