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the three particles that make up atoms are a. protons, neutrons, and isotopes. b. neutrons, isotopes, and electrons. c. positives, negatives, and neutrals. d. protons, neutrons, and electrons.

User Mafso
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The three particles that make up atoms are D. protons, neutrons, and electrons.
These were considered to be the tiniest particles that constitute matter, until quarks were discovered.
User Amit Beckenstein
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