Final answer:
The principal quantum number (n) indicates the energy level of an electron in an atom, relating to its average distance from the nucleus and to which row of the periodic table the element corresponds.
Step-by-step explanation:
The principal quantum number (n) indicates the energy level of the electron within an atom. It defines the general region within an atom where an electron is most likely to be found. Moreover, the principal quantum number corresponds to the row on the periodic table for an atom and relates to how tightly the electron is bound to the nucleus. As the value of n increases, the electron resides farther from the nucleus and represents a higher energy level.
The principal quantum number (n) indicates the main energy level occupied by the electron. It determines the average relative distance of an electron from the nucleus. The higher the value of n, the higher the energy level and the farther the electron is from the nucleus.