The difference between any two stationary state energy is the right response.
In atoms, the orbits of electrons are quantized. Electrons can travel to a higher orbit by absorbing some energy and can move to a lower orbit by releasing energy. Each orbit has distinct energy. Discrete spectra result from the quantization of the orbits, which also quantizes the energy received or emitted. One of the most common ways to introduce and remove energy from atoms is by photon absorption or emission, and the energy involved is equivalent to the change in electron energy as it moves from one orbit to another.
What is atomic quantization?
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