Question

Which one is slightly heavier? Proton or neutron?

Answer 1

Proton:

1. A positively charged sub-atomic particle present in the nucleus of an atom is known as a proton.
2. The mass of a proton is $1.672\times {10}^{-27}\mathrm{kg}$.

Neutron:

1. A charge-less sub-atomic particle present in the nucleus of an atom is known as a neutron.
2. The mass of a neutron is $1.674\times {10}^{-27}\mathrm{kg}$.

The mass of a neutron is slightly greater than that of a proton. Thus, the neutron is slightly heavier than a proton.