The incrasing order (lowest first) for the values of e/m for electron, proton, neutron and alpha particle is

e/m  for electron is 1/0 (as electron has negligible mass),

for proton is 1/1,

for neutron is 0/1, and for alpha particle is 2/4 or 1/2. (Note that charge unit for e is −1, for proton is +1, for neutron is 0, )

and for alpha particle is +2. The mass unit (amu) for e is almost 0, fro p is 1, for neutron is 1, and for alpha particles is 4.

Hope it helps you!

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