A free neutron decays to a proton but a free proton does not decay to a neutron.

Monjur Alahi

A free neutron decays to a proton but a free proton does not decay to a neutron. This is because 

(a) neutron is a composite particle made of a proton and an electron whereas proton is a fundamental particle 

(b) neutron is an uncharged particle whereas proton is a charged particle 

(c) neutron has larger rest mass than the proton 

(d) weak forces can operate in a neutron but not in a proton.


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Salim Ahmed Kawsar

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(c) neutron has larger rest mass than the proton

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