Neutron

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A neutron is a subatomic particle that is composed of three quarks.

Neutrons are baryons. They consist of 1 up quark and 2 down quarks. These quarks are held together by gluons, the bearers of the strong nuclear force.

F E R M I O N S

H A D R O N S

B a r y o n s

N e u t r o n s

n
neutron n̅
antineutron

The neutron was discovered in 1932 by the British physicist James Chadwick.