AAAS: THE PHYSICAL SETTING: THE STRUCTURE OF MATTER - Neutrons have a mass that is nearly identical to that of protons, but neutrons have no electric charge

Neutrons have a mass that is nearly identical to that of protons, but neutrons have no electric charge. Although neutrons have little effect on how an atom interacts with others, they do affect the mass and stability of the nucleus. Isotopes of the same element have the same number of protons (and therefore of electrons) but differ in the number of neutrons.

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