Here Arsenic is a grey-appearing chemical element also termed a metalloid. Arsenic can exist in a metallic state in three forms (yellow, black, and gray; with gray predominating) and in ionic forms. Arsenic is considered to be a heavy metal, and arsenic toxicity shares some features with poisonings by other heavy metals. In 2003 the use of this compound was banned by the US Environmental Protection Agency.
Arsenic and some of its compounds react with proteins, mainly the thiol portions, and uncouples the process of oxidative phosphorylation, thus inactivating most cellular functions. Consequently, arsenic and some of the substances it combines with are deadly poisons to most biologic systems, except for a few bacterial species. Arsenic is used in making insecticides and weed killers. Arsenic is also thought to be carcinogenic, meaning that it has the potential to cause cancer.
Source: https://www.medicinenet.com/arsenic_poisoning/article.htm
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