The p, d, and f orbitals have different sublevels.
For a given configuration, the order of writing the orbitals is not completely fixed since only the orbital occupancies have physical significance. As an example, the ground state configuration of the sodium atom is 1s22s22p63s1, as deduced from the Aufbau principle see below.
The three p orbitals are degenerate, so any of these ml values is correct. The configuration that corresponds to the lowest electronic energy is called the ground state. Problems 1. Without using a periodic table or any other references, fill in the correct box in the periodic table with the letter of each question.
This looks slightly different from spdf notation, as the reference noble gas must be indicated. The noble gases have the most stable electron configurations, and are known for being relatively inert.