Anything with mass is affected by gravity. However the electron has a very very small mass, and electromagnetic forces are so large compared to gravity, that gravity gets swamped out by electromagnetism when looking at electrons. So gravity probably has a negligible effect on them.
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ogoldfinch09 commented on :
Electrons orbit an atom’s nucleus, does gravity have anything to do with this?
Sean commented on :
It is similar, have a look at this link for more info
http://www.ccmr.cornell.edu/education/ask/index.html?quid=126