The least massive principle atomic particle is the electron. Neutrons and protons are much more massive and are about equal in mass. Of course, there are even smaller particles such as quarks which are less massive than even electrons.
least - electron most - the top quark
The 'rest mass' of the photon is zero ... but the photon is never at rest, and it has plenty of mass at the speed of light, at which it is always traveling. so that let's the photon out. Amongst particles that actually have rest mass, but not much of it, the neutrino probably has the least.
Beryllium is the alkaline earth element with the least massive atoms.
There are only three types of Subatomic particleNeutron - Charge = +/- 0Proton - Charge = +1Electron - Charge = -1
The alpha particle is much more massive than a beta particle. A beta particle is an electron, which has very little mass. An alpha particle is a helium nucleus, and consists of two protons and two neutrons.
least - electron most - the top quark
electron
least - electron most - the top quark
electron is least, followed by proton and then neutron. Nucleus will have the highest mass as nucleus contains both protons and neutrons.
The most massive elementary particle known to exist in the universe is 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.
Mercury is the smallest and the least massive planet, out of the eight in our solar system.
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!!
Mercury is the least massive planet in our solar system.
You think probable to alpha particles.
The ranks for nuclear radiation from most massive to least massive are: alpha particles, beta particles, gamma rays, and neutron radiation. Alpha particles are the most massive and have the least penetration power, while neutron radiation is the least massive and can penetrate deeply into materials.
an alpha particle is made of two protons and 2 neutrons. its basically the same as the nucleus of a helium atom