chemical element

US /ˈkem.ɪ.kəl ˈel.ɪ.mənt/
UK /ˈkem.ɪ.kəl ˈel.ɪ.mənt/
"chemical element" picture
1.

a species of atoms having the same number of protons in their atomic nuclei

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Oxygen is a common chemical element.
The periodic table organizes all known chemical elements.