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

Energy Level

Explanation:

Energy Level of an electron in an atom is the possible state for the electron that is proportional to its distance to the nucleus.

Ground state is the lowest possible energy level of an atom, ion, or molecule and its electrons. When there is an increase in energy, the electron moves to a higher energy level and it is said to be excited. Excited state is the state of an electron above the ground level. If more than one quantum mechanical state is at the same energy, the energy levels are "degenerate". This phenomenon is called degenerate energy levels.

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