(n+l) Rule From this rule, we can get information about the difference in energy between two orbitals. According to the Aufbau principle, electrons are filled into atomic orbitals in the increasing order of orbital energy level.(n+l) rule helps to determine which one between two given orbitals will occupy by an electron. As we know that there are four quantum numbers, namely, principal(n), azimuthal(l), magnetic(m), and spin(s) quantum numbers. They are…