Skip Navigation COURSE:  IS-3 
Fundamental Concepts
LESSON:  Radioactivity
FEMA Emergency Management Institute
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  Protons and Neutrons Back Next
  Diagram of atom with protons, neutrons, and electrons labeled

Protons and neutrons are heavy particles that are found in the center, or nucleus, of the atom. The basic difference between a proton and neutron is their associated electrical charge. Protons have a positive charge and neutrons have no charge.

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