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The energy-level diagram for a theoretical atom is shown below.

Created for Albert.io. Copyright 2017. All right reserved.

If a gas of these atoms is excited and then allowed to fall back to ground state, which one of the following photon energies will never be emitted?

A

$1.2\text{ eV}$

B

$2.5\text{ eV}$

C

$6.5\text{ eV}$

D

$9.0\text{ eV}$

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