This new paper talks about the elementary subatomic particles on a level hypothetical–theoretical–experimental detection studies in divisions of physics like theoretical, statistical physics, astrophysics, cosmology, particle physics and applied physics. Begining of the Article is connected with discoveries of X17 (Protophobic X Boson Particle) and the fifth fundamental force of all Universe, called “quintessence” – the energy of Dark Matter or Dark Energy. The first part of the Paper is dedicated to a Hungarian nuclear physicist Prof. Dr. Attila Krasznahorkay, Dr.Sc. from Research Center Atomki Debrecen. Prof. Dr. Attila Krasznahorkay, Dr. Sc. and his team at Atomki had successfully observed the same anomalies in the decay of stable ⁴₂Helium bombarding atoms and unstable transitions of Be⁸, Li⁷, He⁴ had been observed in Beryllium–8, strengthening the case for the existence of the X17 particle, the name of this particle means that has energy about 17 MeV (protophobic), because ignoring protons in interactions. Mean lifetime is approximately 10^-14 s. Further parts of text describe hypothesis, theories and detection and significance of elementary particles, which are candidates to a building the Dark Matter and Dark Energy like Dark Photons, WIMP’S, Photinos, Neutralinos, Axinos and Axions.