Question

a certain energy that an electron in an atom occupies

Answer 1

The energy that an electron in an atom occupies is called an energy level or electron shell. Each energy level has a specific amount of energy associated with it, and electrons can move between different energy levels by absorbing or emitting energy in the form of photons. The energy levels are identified by a principal quantum number (n), where n=1 corresponds to the lowest energy level (closest to the nucleus), n=2 corresponds to the next energy level, and so on. The energy level determines the distance of an electron from the nucleus and its overall energy state.