In the atom the electron is the lightest.
Subatomic particle
particle whose dimensions is less then that of atom are said to be subatomic particle . they may be charged or uncharged .eg neutron is uncharged subatomic particle where as electron ,proton , positron are charged subatomic particle.
Matter
protone
An electron particle
Subatomic particle
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.
particle whose dimensions is less then that of atom are said to be subatomic particle . they may be charged or uncharged .eg neutron is uncharged subatomic particle where as electron ,proton , positron are charged subatomic particle.
Hydrogen has the smallest atomic mass at roughly 1.008 grams per mol (6.02x10^23 atoms)
Matter
protone
The neutron is the subatomic particle that has appreciable mass and lacks a charge.
The neutron is a subatomic particle that has mass nearly equal to that of a proton but carries no electrical charge.
An electron particle
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