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Neutrons have no charge because they are made up of smaller particles, called quarks, which carry fractional charges that, when combined, add up to zero. There is one up quark and two down quarks in a neutron. The up quark has a fractional elementary charge of +2/3 while each down quark's charges are -1/3. If you add those charges up, +2/3 - 1/3 - 1/3, you get zero.

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14y ago

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