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Chemical element - Wikipedia
List of chemical elements - Wikipedia
Chemical element | Definition, Origins, Distribution, & Facts
Periodic Table - Ptable
List of chemical elements - Periodic Table
Periodic table | Definition, Elements, Groups, Charges, Trends,
Periodic Table of Elements - PubChem
What Is a Chemical Element? Definition and Examples - ThoughtCo
What Is an Element in Chemistry? Definition and Examples
Element List – Element Names, Symbols, and Atomic Numbers