Electrons have energy states in atoms, which
exist at set levels of energy as determined by
the laws of quantum mechanics. When a chemical
reaction occurs, the electrons change energy
states, and if the energy released is in the
form of light, then the energy of the photons
emitted will be equal to the difference in the
energy states the electrons are moving. Violet
light is more energetic than red light, so
requires more energy.
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