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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.

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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.
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User Amit Beckenstein
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