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Periodic Table - Ptable
Scandium - Wikipedia
Scandium - Element information, properties and uses | Periodic Table
An Overview of Scandium (Sc or Element 21) - ThoughtCo
Periodic Table of Elements - PubChem
Scandium - Periodic Table
WebElements Periodic Table » Scandium » the essentials
Scandium (Sc) - Periodic Table
Periodic table - Wikipedia
Scandium (Sc) - Periodic Table