Protons and neutrons are the same size relatively, and are bigger than alpha particles and electrons; but, electrons are smaller than alpha particles.
among these Electron has the least mass....
Electron, proton, nucleus, atom
In beta particle emission, a neutron in the nucleus converts into a proton, an electron (beta particle), and an antineutrino.
The electron is actually the smallest particle. The neutron is the largest particle, followed closely by the proton. The electron is much, much smaller.
This particle is the neutron.
Electron!
Hydrogen has the smallest atomic mass at roughly 1.008 grams per mol (6.02x10^23 atoms)
The smallest particle in the atom is the electron.
Ion.
The electron is the smallest having about 1/1836th the mass of a proton or neutron, which means that basically an electron has no mass. The neutron and proton weigh the same both having a mass of 1.
Well, that's kinda a trick question because an electron is pure energy. An electron particle is also the smallest of the 4, so its the electron (eventhough an electron is a weichtless particle such as a graviton or magneton! Hope I helped!!
The quarks, building blocks of proton and neutron.