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Deleted member 619
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If electrons can not be broken down into smaller particles, does that mean they are infinitely hard?
That's not really the right kind of question. Hardness isn't something that applies at those scales.
All else aside, our current working model has it that an electron is a point particle, which is to say that it has no spatial extent. It's not exactly elastic, but it's not exactly inelastic either. It cam absorb and emit energy in the form of photons, for example. In fact, if the standard model of particle physics is correct, what thge electron actually is is a tiny little black hole.