The increasing order of e/m values for electron, proton, neutron and alpha particle is

e/m of neutron is zero as it is chargelesse/m of α : p : e = 2/4 : 1/1 : 1/1/1836                       = 1/2 : 1 : 1836                       = 1 : 2 : 3672increasing order of e/m values is n, α, p, e.