Again , the neutron is not an elementary particle but a composite of an up quark and two down quarks -LRB- udd -RRB- .
A neutron is made of one up quark and two down quarks , which is why its charge is 0 .
A neutron is made of one up quark and two down quarks , which is why its charge is 0 .
Simplify: Again , the neutron is not an elementary particle but a composite of an up quark and two down quarks -LRB- udd -RRB- . Output: