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Chemical element
species of atoms having the same number of protons in the atomic nucleus and the same chemical properties, but not nessarily the same mass, or the same stability (or half-lifetime if they are unstable)
Pronunciation
/ˈkɛməkəl ˈɛləmənt/
/ˈkɛmɪkəl ˈɛlɪmənt/
Categories
group or class of chemical substances
chemical substance