• Question: how small are protons, electrons and neutrons?

    Asked by rory the racing car to Kerry on 12 Nov 2014.
    • Photo: Kerry O'Shea

      Kerry O'Shea answered on 12 Nov 2014:

      Good question! They are very very small, so small that it’s difficult to imagine! Neutrons are slightly bigger than protons, and electrons are much smaller than that!
      For example, a proton has a mass of 0.0000000000000000000000000017 kg!

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