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  1. Periodic Table - Ptable

  2. Krypton - Wikipedia

  3. List of chemical elements - Periodic Table

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

  5. Krypton - Periodic Table

  6. Periodic Table of Elements - PubChem

  7. Krypton (Kr) - Periodic Table

  8. Periodic table - Wikipedia

  9. Krypton (Kr) - Atomic Number 36

  10. Krypton (Kr) [36] — Chemical Element — Periodic Table