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Matter is composed of exceedingly small particles called atoms. An atom is the

smallest unit of an element that can participate in a -------

User Magda
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Answer:

Chemical reaction.

Step-by-step explanation:

User Bojan Kogoj
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Answer:

Matter is composed of exceedingly small particles called atoms. An atom is the

smallest unit of an element that can participate in a chemical reaction.

User MatheM
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