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 Sci Advisor PF Gold P: 3,273 Well, classically it all depends on what radius you attribute to the electron, if it is not to be treated as a point charge. Throwing in some numbers to get an OOM feel for the question we find: Classical radius of electron = 2.8 x 10-13 cm Reduced mass of electron in H atom = 9.1 x 10-27 gm G = 6.7 x 10-8 dyn cm2gm-2 c2 ~ 1021 cm2 sec-2 $$\frac{2GM}{rc^2}$$ = 4.8 x 10-43, pretty short of the value "1" required for an event horizon... Garth