Electrons lie in certain orbitals. Like the Bohr Postulates.
Electrons require a certain threshold energy in order to move the path. Threshold energy is the minimum energy required for electrons to rise to a higher orbital. It is not continuum, but discrete, meaning quantified. These quantized energy packs in the form of radiation or wave are called energy quanta. According to Max Planck, the magnitude of the energy is h f with h is the planck constant of magnitude 6.63 x 10 ^ {- 34} joule seconds.
Electrons can only have energy in this split quanta multiples. Not only on electrons but also photons and all the tiny particles at the subatomic level. This is the origin of the quantum names in the quantum physics we study. Quantum physics studies the behavior of subatomic particles, their dynamics and their interactions, and their relation to the fields that affect them. " [1]