Are electrons affected by gravity? Again, probably a very naive question but just wanted to make sure. Are electrons affected by gravity? I was hoping someone could point me in the direction of some experiments that prove this. 
 A: By equivalence principle, everything is affected by gravity, just like everything is affected by inertial forces. This includes electrons.
I've noticed the quantum-gravity tag. You don't need quantum gravity if you are considering weak gravitational fields, because you can treat them as a classical background, even if you are considering quantum-mechanical nature of some objects (like electrons) in such gravitational fields.
A: Yes, they are affected by gravity. At least they should, since they have mass. However as far as I am aware there is no experiment that directly showed how gravity affects electrons. 
One problem is that electrons have a tiny mass and the gravitational force is much much weaker than the Coulomb force, making it difficult to observe it.
The closest to a proof is the determination of the ratio of charge to mass of the electron ($e/m$) from the radius of an electron beam in a homogeneous magnetic field. Together with Millikan's Oil Drop Experiment which measured the electric charge of the electron, this provides a number for the electron mass.
However this mass is the inertial mass of the electron. For all we know, inertial mass is equal to the gravitational mass, but if you question this, I believe there is no "proof".
A: Yes, Electrons have mass and everything with mass is affected by gravitation(gravity).
https://en.wikipedia.org/wiki/Electron
https://en.wikipedia.org/wiki/Oil_drop_experiment
