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Intraparticle ion motions are critical to the structure and properties of nanomaterials, but rarely disclosed. Herein, in situ visualization of ion motions in a single nanoparticle is presented by dark‐field microscopy imaging, which shows HgCl2‐induced structural transformation of amorphous selenium nanoparticles (SeNPs) with the main composition of Se8. Owing to the high binding affinity with selenium...