Definition: The possible state for an electron of an atom that is proportional to its distance to the nucleus.

"Energy Level" is the correct approach.

Explanation:

An electric charge electron density during an atomic seems to be the potential condition for this with the electron and therefore is proportional to its density from the nucleus. The ground state seems to be a particle, nucleus, and perhaps molecule with the corresponding energy level as well as its electrodes. The electron travels to something like a higher or excited energy state whenever there's an improvement in electricity, and has also been stimulated.

There are no metaphors.