A neutron is NOT a fundamental particle. A neutron is a baryon which means it is made from 3 quarks. 

Now the quarks that makes protons and neutrons are up and down quarks and they carry a charge. 

Now up quarks has a charge of +2/3 
down quarks has a charge of -1/3 

So an arrangement of 2 down quarks and an up quark yields no net charge and you have a neutron. 
An arrangement of 2 ups and a down, yields a charge of +1 and you have a proton.
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Answers

2016-01-15T18:57:49+05:30
A neutron is made of two down uarks and one up quark.one up quark has a charge of +2/3, and the two down quarks each have a charge of -1/3. So these charges cancel out that's why a neutron has no charge and hence is neutral
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2016-01-15T19:17:48+05:30
A neutron is NOT a fundamental particle. A neutron is a baryon which means it is made from 3 quarks.  Now the quarks that makes protons and neutrons are up and down quarks and they carry a charge.  Now up quarks has a charge of +2/3  down quarks has a charge of -1/3  So an arrangement of 2 down quarks and an up quark yields no net charge and you have a neutron.  An arrangement of 2 ups and a down, yields a charge of +1 and you have a proton.
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