Answer to:
What is the smallest subatomic particle? So we're all on the same page here, "size" doesn't really exist in the way we think of it on a quantum level. There is *no* experimentally verified radius for the electron or any of the quarks. As best we can tell, they are point particles, occupying no physical space. Neutrons and protons have "size", i.e. seem to occupy physical space, because they are quarks...

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