Though similar to tendons, ligaments connect bone to bone and help to stabilize joints they surround. They are composed mostly of long, stringy collagen fibers that create bands of tough, fibrous connective tissue.
An electron is a negatively charged subatomic particle. It can be either free (not attached to any atom), or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. The larger the spherical shell, the higher the energy contained in the electron.
The subatomic particle you are asking about is the electron. There are other subatomic particles which make up the neutrons and protons, but they are not involved in chemical â¦bonding. The only thing that makes up an electron is an electron, nothing else.