The smallest mass is the electron neutrino, with a mass of 2.2 eV. [See source.] This is a mass roughly one millionth the mass of an electron. And an electron's mass is about 1/1836 that of the proton's mass. So when it comes to that neutrino, we're talking about really really tiny.
As for spatial size, the theoretical string is a short as 1E-35 meters.. And some say, nothing can ever be smaller in length. But strings are only hypothetical; they've never been observed, either directly or indirectly.
As for spatial size, the theoretical string is a short as 1E-35 meters.. And some say, nothing can ever be smaller in length. But strings are only hypothetical; they've never been observed, either directly or indirectly.
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Well, since we now know that everything is made up of atoms, the only thing that we know of that is smaller is subatomic particles, and their nucleus's. So far, that's what we know to be the smallest.
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The parts of an atom. An atom cannot be broken down. It consists of the electrons and nucleus which is made up of protons and neutrons.
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as in visual things? well the proteins
as in something we know its there but we can't see it would be the proton
as in something we know its there but we can't see it would be the proton
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An atom. It's the smallest unit of matter
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My penis.