How do you do argon with atomic orbitals?

To describe argon using atomic orbitals, you begin by noting that argon has an atomic number of 18, meaning it has 18 electrons. These electrons occupy orbitals according to the Aufbau principle, filling them in order of increasing energy: 1s² 2s² 2p⁶ 3s² 3p⁶. This configuration shows that argon has a full outer shell (the third shell), making it chemically inert and stable. The 3s and 3p orbitals are the highest occupied orbitals in argon's electron configuration.