Protons and neutrons are the basic constituents of atomic nuclei, which, combined with electrons, form atoms. Photons are the fundamental units of electromagnetic radiation, which includes radio waves, visible light, and X rays. The neutron is unstable as an isolated particle, with an average life of 917 seconds. The existence of other particles has been predicted, but they have not yet been observed-such as the graviton, thought to transmit the gravitational force. Some elementary particles, such as the photon, are their own antiparticles.
Subatomic particles are the basic units of all matter and energy.
However, all that physicists have around them in the every day world are very low-mass particles. During this collision, the particle's kinetic energy is converted into the formation of new massive particles. It is through this process that we can create massive unstable particles and study their properties. As physicists kept discovering more and more particles all the time. They had to decide on a naming convention to keep track of all these particles.