Question

Which two particles are about the same size *?

Answer 1

Answer:

The nuclear particles, protons and neutrons, are conceived to have a positive electronic charge, and a neutral charge respectively. The protonic mass is 1.672621898(21)×10−27⋅kg . And the neutron mass is 1.674927471(21)×10−27⋅kg , so to a first approx. these masses are equal.