## Chemistry: The Central Science (13th Edition)

The $3p$ orbital is higher in energy than the $3s$ orbital.
*Remember: The further from the nucleus an orbital is, the higher its energy is. Therefore, taken from the information that the average distance from the nucleus of a $3s$ electron in a chlorine atom is smaller than that of a $3p$ electron, the $3p$ orbital is higher in energy than the $3s$ orbital.