Final answer:
Arsenic is made up of arsenic atoms, a highly poisonous metalloid used in various chemical applications.
Explanation:
The element Arsenic (As) is made up of arsenic atoms. Arsenic is a highly poisonous metalloid with three allotropic forms - yellow, black, and gray, with the gray allotrope being the most common. Compounds of arsenic are used in various applications such as insecticides, weed killers, and alloys.
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