Answer:
B. Excited state
Explanation:
Energy levels higher than the ground state are called the excited states. This concept is based on the premise that electrons can move round the nucleus in certain permissibe orbits or energy levels.
The ground state is the lowest energy state available to the electron. This is usually the most stable state.
The excited state is any level higher than the ground state. An electron in an energy level has a definite amount of energy associated with it at that level.
Lithium and nitrogen have the same electron energy levels, actually 2 levels.
I think it's D. helps to analyze the experiment because the purpose is to show how you got the conclusion that you did and how to keep track of any mistakes you might have made along the way.
