Neutron
This is a positron.
Alpha radiation consists of particles with a charge of +2 and a mass of 4 amu, equivalent to a helium nucleus. Beta radiation consists of particles with a charge of either -1 or +1 and negligible mass, corresponding to electrons or positrons.
Free radiation I suppose. But gamma radiation, is charge free. As is UV, IR, ... ..
A particle that has a mass of 1 and a charge of 1 plus is a proton.
The electron has a charge of -1; but the electron has a mass.
Neutrons (mass = 1 and charge = 0) and Protons (mass = 1 and charge = +1)
Proton - Relative Atomic Mass of 1, charge of 1. Neutron - Relative atomic mass of 1, charge of 0. Electron - Negligible mass (0), charge of -1.
The mass of an electron is much smaller than the mass of a proton. An electron has a charge of -1, while a proton has a charge of +1.
Proton rest-mass . . . 1.67 x 10-27 kg Proton charge . . . . . +1 elementary charge (1.60 x 10-19 coul)
1n0 1 = mass, 1 amu 0 = no charge
electron = relative charge = 1- relative mass = 1/1840 proton = relative charge = 1+ relative mass = 1 neutron = relative charge = 0 relative mass = 1
A neutron is the subatomic particle with a charge of 0 and a mass of 1 atomic mass unit.