- Wikipedia: Arsenic
 - Hyperlinked article about the element including notable characteristics, applications, history, occurrence, precautions, and more. - EnvironmentalChemistry.com: Arsenic
- Features an overview, name in other languages, atomic structure, physical properties, chemical properties, history, and regulatory information.
- Chemical Elements.com: Arsenic
- Contains basic stats, atomic structure, and isotopes.
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