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.

We first assume that this gas is an ideal gas where it follows the ideal gas equation. the said equation is expressed as: pv = nrt. from this equation, we can predict the changes in the pressure, volume and temperature. if the volume and the temperature of this gas is doubled, then the pressure still stays the same.