- Chemical Elements.com: Chlorine
 - Overview with basic information, atomic structure, isotopes, and more. - Chlorine
- Provides an insight into the uses and benefits of Chlorine.
- Chlorine Online
- Information about chlorine and its derivatives from Euro Chlor, the federation representing the European chlor-alkali industry.
- EnvironmentalChemistry.com: Chlorine
- Features overview, name in other languages, atomic structure, chemical properties, physical properties, and regulatory information.
- WebElements: Chlorine
- Covers essential data, description, history, uses, compounds, electronic properties, and more.
- Wikipedia: Chlorine
- Hyperlinked article on the element with notable characteristics, applications, history, occurrence, precautions, and more.
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