In the atom this particle is the electron.
Generally in the particle physics: photons, gluons, neutrinos.
The electron is the subatomic particle with the least mass. It has a mass of about 1/1836 of a proton or neutron.
among these Electron has the least mass....
least - electron most - the top quark
The three main subatomic particles are the proton, neutron, and electron. Of these three, the electron has the least amount of mass at about 0.0005 amu or atomic mass units.
A neutron is the subatomic particle with a charge of 0 and a mass of 1 atomic mass unit.
The tau neutrino has mass and is denoted with the symbol μ.
An "element" is not a subatomic particle. Your question makes no sense and is therefore unanswerable.Another answer:Since an element is not a subatomic particle, the only answer can be a proton.
The neutron is a subatomic particle that has mass nearly equal to that of a proton but carries no electrical charge.
Matter
Protons and neutrons have the mass of 1 amu.
The electron has the smallest mass between subatomic particles: 9,10938291(40).10-31 kg.
the neutron