A chemical group derived from arsenic, analogous to aryl groups derived from benzene in organic chemistry.
From arsenic plus -yl suffix, which denotes chemical groups. Mirrors the naming pattern of phenyl, methyl, and other common organic groups.
Organic chemists name chemical groups with -yl endings (methyl, phenyl, arsyl)—it's like having molecular SCRABBLE tiles where each tile represents a building block they can attach to larger molecules.
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