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# Ionization Energy

APPH12-EUUM2U

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

If an atom initially has an electron at the n=2 energy level, what minimum energy must be absorbed by the atom in order to ionize the atom?

A

$2.5\text{ eV}$

B

$4.3\text{ eV}$

C

$6.5\text{ eV}$

D

$10.8\text{ eV}$