Electron jump.

Energy changes in an electron jump.

 

The energy is emitted or absorbed only when the electrons jump from one energy level to another.

When energy is supplied to an atom its electrons absorbs one or more quantum of energy and jump to higher energy levels. The higher energy state is called its excited state.

When the electron jump back to the lower energy level, it radiates the same amount of energy. This amount of energy emitted or absorbs is given by the difference of the energy of the two energy level concerned. That is,  DE = E2 – E1.