(adsbygoogle = window.adsbygoogle || []).push({}); What is mean by an "elementary particle"?

I have always been intriguing about the definition of an "elementary paticle". Can we actually "define" a photon as a wave function $\psi(r,t)$ solution of the Maxwell Equation and "define" an electron as a wave function solution of the Klein-Gordan equation and so on?

How about the "definition" of photons and neutrons and the others?

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# What is mean by an elementary particle ?

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