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Chapter 4 Section 1 Atomic Structure Whatâs in an Atom? ⢠Atoms are made of protons, neutrons, and electrons. ⢠At the center of each atom is a small, dense nucleus with a positive electric charge. ⢠The nucleus is made of protons (a subatomic particle that has a positive charge) and neutrons (a subatomic particle that has no charge). ⢠Moving around outside the nucleus is a cloud of electrons: subatomic particles with negative charges. Chapter menu Resources Copyright © by Holt, Rinehart and Winston. All rights reserved.