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Neutron
A neutron is a subatomic particle that is composed of three quarks.
Explanation
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
neutronn̅
antineutron
Additional information
The neutron was discovered in 1932 by the British physicist James Chadwick.