I read that the electron is a point particle. This
sense if it
is a fundamental particle, since if it had non-zero volume whatever it
was made out of would be more fundamental.
The problem is, I thought the electron had mass--orders of magnitude
smaller than the proton, but still a measurable mass...
Can a point particle that takes up no space have mass? How?
I suspect my assumptions are wrong somewhere.
Electrons are not very well understood. Although their behavior can be
predicted with unbelievable accuracy, and we have lots of verifiable facts
about electrons, nobody really knows what an electron is.
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Update: June 2012