The atom has a vacancy in its inner shell; an electron has moved to the outer (valence) shell. The result is an unstable excited state. What will be the fate of the electron?

The atom has a vacancy in its inner shell; an electron has moved to the outer (valence) shell. The result is an unstable excited state. What will be the fate of the electron?

The answer is :

An electron will move back to the inner shell, restoring the ground state as the atom gives off energy.

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