Definition of "chemical element" [chemical element]

• Any one of the simplest chemical substances that cannot be decomposed in a chemical reaction. Chemical elements consist of atoms which have the same number of protons. (noun)

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• "Less than nine months later, Kirkman did a voluntary recall of seven of their products because they contained high levels of antimony, a chemical element used in flameproofing, enamels, and electronics—and one that some anti-vaccine activists had recently been proposing as a potential cause of autism."