First, to get to the bottom of this question, we need to first figure out the concepts of quanta, energetic particles, fundamentals, particles, and elementary particles.
quantum:
A quantum is the smallest unit that can represent the properties of a substance and a physical quantity, rather than referring to a particular substance. If a physical quantity exists as the smallest indivisible fundamental unit, then the physical quantity is quantized, and the smallest unit is called a quantum, and it can be seen that the quantum is only the name of the smallest unit, it is not a unit, nor is it a matter.
Energy Quantum:
When the German scientist Planck did the blackbody radiation experiment on the energy of charged particles, he found that if the energy of charged particles is explained by continuity, the calculated data is always incompatible with the data obtained by the experiment, and only when the particle properties (quantumness) are used to explain the energy of the charged particles, the calculated data can match the data obtained by the experiment. Moreover, Planck also concluded that the energy of a charged particle can only be an integer multiple of the minimum energy value h, h≈ 6.6260693(11)×10^-34 J·s, in focal (J). Later, this h was called Planck's constant. Each energy particle is equal to hν, where ν is the frequency of the electromagnetic waves radiated.
Particles and elementary particles: The atoms first discovered belong to particles, atoms were initially considered to be the smallest material components that exist in a free state, but later it was found that atoms also contain protons, neutrons and electrons, of which electrons can no longer be divided, called elementary particles. There are actually many kinds of particles, in addition to protons, neutrons, electrons and atoms are particles, as well as mesons, quarks, leptons... It is still being discovered.
Among them, protons and neutrons can be said to be composed of other elementary particles. Protons can be further divided into quarks and gluons, and neutrons can be divided into two lower quarks and one upper quark.
Standard Model of Particle Physics Diagram
Why is it called a Standard Model of Particle Physics diagram instead of a Diagram of the Standard Model of Elementary Particle Physics? That's the end.
At present, scientists have also observed that electrons can also be divided into holes, spinons and orbiters.
In fact, the term elementary particles has become a thing of the past. Because, in the continuous progress of science, today's elementary particle particles may be just particles tomorrow. It was as if the electrons above had been found to be more dividable.