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  1. Sulfur - Wikipedia

  2. Sulfur | Definition, Element, Symbol, Uses, & Facts | Britannica

  3. Sulfur - Element information, properties and uses | Periodic ...

  4. Sulfur | S (Element) - PubChem

  5. Sulfur (S) - Periodic Table

  6. WebElements Periodic Table » Sulfur » the essentials

  7. Sulfur (S) - Periodic Table