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Electrons are much smaller than most atomic nuclei, so we are able to use them as a medium to view the features of atoms. But seeing an electron is not possible. Electrons are incredibly tiny and have extremely low mass. They move extremely fast, and due to the Heisenberg Uncertainty Principle, their EXACT position is 100% unknowable.
The beams of electrons Thomson generated in his Crookes tube experiment proved particularly useful. Today similar beams are generated by electron microscopes, and the most powerful of these microscopes can actually create images of individual atoms.