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Science

Atomic structure

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Relative masses and charges

Protons and neutrons have the same mass, which is about 2,000 times larger than the mass of an electron.

Protons and electrons have an electrical charge. This electrical charge is the same size for both, but protons are positive and electrons are negative.

Neutrons have no electrical charge; they are neutral.

These properties are summarised in the table:

Summary of the relative mass and charge of particles

ParticleRelative massRelative charge
proton1+1
neutron10
electron0.0005−1

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