Because of its nuclear force electrons are unable to form group with any other particle. A positron with single neutron-like shell is a proton. If positron has two neutron-like shells on either side of its equator, it becomes a deuteron. Anti-matter and annihilation of matter is also briefly explained. It gives brief explanation on construction and nature of nuclei of atoms, nuclear spin, formation of atoms, motion of electrons in planetary orbits around spinning nucleus of atom and self-sustenance by atoms.
Deuterons are major components of nuclei of atoms.
When electrons are moving in stable orbits around nucleus, central force is provided only by gravitational attraction between them. Size and eccentricity of orbits depend on the real energy level of atom. In normal circumstances it is not possible to detach electrons from their orbits with out using excessive force. It also gives information on secondary electric field of some atoms, thermionic emission of electrons, mass defect, formation of molecules and artificial disintegration of subatomic particles. Brief explanation on formation of molecules by atoms is also given.