What is a neutron?

A diagram of an atom showing the nucleus, which contains neutrons

A diagram of an atom showing the nucleus, which contains neutrons
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Neutrons are very tiny particles (smaller than an atom) that are found in the nucleus of atoms.

They are made from three quarks: two down quarks, and one up quark.         

Neutrons are very common- everything on Earth is around 50% neutrons, even you!

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