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Energy emitted - hydrogen atom

What is the energy of the photon emitted when the electron of a hydrogen atom makes a transition from the quantum level n=3 to the level n=1?

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The energy of an electron in an atom is negative. The negative sign indicates that we need to give the electron energy to move it from the hydrogen atom.
<br> When the electron transits from an excited state to its lower energy state, it will gice off the same amound of energy needed to raise to that level. This emitted energy is a photon. The energy of the ...

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