Electron microscopes look at what kind of specimens ? – Science

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Atoms (Old answer)

This is wrong. Atoms are too small to be viewed in an electron microscope. Electron microscope can see things that are 2nm, but nothing smaller than that.
An electron microscope can either be used to see the surface of a cell (SEM=cCanning electron Microscope) or to see the structures inside a cell (Transmission Electron Microscope).
An electron microscope is the only kind of microscope that can be used to see all the structures inside a cell. You can see the smallest parts using fluorescens and staining the small ones, thus making them visible because they will be glowing while the rest of the cell is dark, but you can’t actually see it. The plasma membrane can only be seen properly by using electron microscope.

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