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Periodic Table - Ptable
Krypton - Wikipedia
List of chemical elements - Periodic Table
Krypton - Element information, properties and uses | Periodic Table
Krypton - Periodic Table
Periodic Table of Elements - PubChem
Krypton (Kr) - Periodic Table
Periodic table - Wikipedia
Krypton (Kr) - Atomic Number 36
Krypton (Kr) [36] — Chemical Element — Periodic Table