Nucleons are composite particles made up of protons and neutrons. Nucleons are an important part of an atomic nucleus and therefore, they are important if you are interested in learning particle physics or quantum chromodynamics.
Every mass in the matter is made up of atoms and molecules, and atoms are the smallest part of the particle. Every atom is made of nucleons, which are further divided into photons, neutrons and electrons.
Since nucleons are an integral part of the atomic nucleus you will never find independent nucleons. The atomic nucleus of the particles strongly holds the nucleons with a strong force. However, when the force is broken it can generate a lot of power, and that power is generally termed as the nuclear energy which is very similar to what is used in nuclear bombs.
Nucleons found in radioactive decay substances like uranium can be harmful to the life of people as it can spread alpha radiation in just a matter of seconds.
