Protons and neutrons have the mass of 1 amu.
The neutron and the proton have masses close to 1 amu.
The electron is the subatomic particle with the least mass. It has a mass of about 1/1836 of a proton or neutron.
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.
They are calculated by atomic mass units (amu) proton-1amu neutron-1amu electron-0amu
The neutron is a subatomic particle that has mass nearly equal to that of a proton but carries no electrical charge.
1 amu (atomic mass unit) is a unit of mass equal to one twelfth of the mass of a carbon-12 atom. It is used to express the mass of atomic and subatomic particles.
Matter
The electron has the smallest mass between subatomic particles: 9,10938291(40).10-31 kg.
the neutron
neutron