Explanation:
It suggests that the extranuclear part consists of electrons in specific spherical orbits around the nucleus.
- The concept is based on the premise that the electrons move round the nucleus in certain permissible orbits or energy levels.
- The ground state is the lowest energy state available to the electrons. It is the most stable state.
- The excited state is any higher energy level than the ground state.
- An electron in an energy level has a definite amount of energy associated with it at that level.
- The electron can undergo transitions from one level to another.
- This way energy of an electron is quantized to each level.
