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  1. Titanium - Wikipedia

  2. Titanium | Element, Meaning, Symbol, Density, Properties

  3. Early discoveries about titanium - Science Learning Hub

  4. Titanium - Element information, properties and uses | Periodic Table

  5. Titanium | History, Uses, Facts, Physical & Chemical Characteristics

  6. Titanium Chemical & Physical Properties - ThoughtCo

  7. WebElements Periodic Table » Titanium » historical information

  8. titanium summary | Britannica

  9. Titanium | Elements | RSC Education

  10. William Gregor - Wikipedia