If an electron is thought if more as a wave than a particle, how does it have a mass?

Question

Thought of*

In: Physics

Answer 1

First: Its not correct to say that an electron(or anything else) is thought of more as a wave. Its called duality because it is exactly that, it display properties of both waves and particles simultaneously depending on the circumstance. Double slit experiment is the go to illustration of this behaviour.

https://en.wikipedia.org/wiki/Double-slit_experiment

Second: Energy mass equivalence. In many ways, particularly at the quantum level, mass doesnt exist in any meaningful way that our intuition understands(This is broadly true on any scale). As an example, the mass of a a given atomic nucleus is more than the sum of its constituents. The missing mass is called the mass defect and makes up the binding energy of the nucleus.

https://en.wikipedia.org/wiki/Mass%E2%80%93energy_equivalence

I realize this really isnt ELI5 at all, but to be frank there is no ELI5 answer, which is both accurate and meaningful, to your question.