What type of particle has a size of 10^-21 m?

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Hi i am wondering what sort of particle has a size of magnitude 10^-21 m, I am thinking perhaps a string? Any help would be appreciated.

Ray
 
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None that we know so far...Sides,according to the SM,the presumably finite extended elementary particles are pictured by the very famous model of pointlike particle...

Daniel.
 

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