Neutron:
Mass: 1,00866491600(43) amu.
Electron:
Mass: 5,4857990946(22)×10−4 amu.
Proton:
Mass: 1,007276466812(90) amu.
The electron has the smallest mass between subatomic particles: 9,10938291(40).10-31 kg.
Positron
Proton or neutron
A baryon is a variety of heavy subatomic particle created by the binding of quarks by gluons.
Basically, atoms are made up of subatomic particles. Subatomic, sub- meaning smaller that, so subatomic particles means "a particle smaller than an atom". So It means that it is a particle within the atom.
The electron is the subatomic particle with the least mass. It has a mass of about 1/1836 of a proton or neutron.
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.
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 tau neutrino has mass and is denoted with the symbol μ.
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.
neutron
the neutron
Both one proton and one neutron each has a relative mass of 1 a.m.u.