In an electron gun, where do the electron come from, where do they go?

Subject: In an electron gun, where do the electron come from, where do they go?

Date: Tue Dec 20 10:56:05 2005
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Area of science: Physics
ID: 1135101365.Ph

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Every description I read about an electron gun has a "cloud of electrons" being 
emitted.  Where do these elctrons come from?  Assumming they are shed from 
atoms, what happens to those atome?  Do they acquire replacement electron?  On 
the other side the surfaces that electrons strike, what happens to those 
electrons?  Are they absorbed into other atoms?  How does that change there 
nature?

Re: In an electron gun, where do the electron come from, where do they go?

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