How small is an electron?
Daniel and Kelly’s Extraordinary Universe
00:00
The Size of the Protons and Neutrons
The size of the proton that's made up of those quarks, yeah, would be about a mile. Compared to the electron radius, the proton is super tiny. The nucleus of an atom with 100 protons and neutrons in it isn't much bigger than one proton. It's just like packing marbles together.
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