Aufbau diagram of argon

argon | Aufbau diagram

Build the ground-state orbital diagram for: argon (Ar) Plan: • Look up the abbreviated (condensed) ground electronic configuration. • Use the electronic configuration to identify the outermost electrons. • Determine the energetic ordering of atomic orbital subshells. • Use the following representations: a gray rectangle for an atomic orbital, an up arrow for an alpha (spin-up) spin state and a down arrow for a beta (spin-down) spin state. • Follow the Pauli exclusion principle by representing the first electron in each atomic orbital with an alpha spin state and the second electron with a beta spin state. • Place electrons into orbitals following the Aufbau principle and Hund's rule. The abbreviated ground electronic configuration for argon is: [Ne]3s^23p^6 Electrons in atomic orbitals outside of the neon core, [Ne], are the outermost electrons: 3s^23p^6 Atomic orbital energy usually increases from 1s to 8s in the following order: Follow the Aufbau principle by filling the atomic orbitals with electrons in the following order: 3s < 3p Place two electrons as an alpha-beta pair into the 3s orbital: 3s Place six electrons as alpha-beta pairs into the three 3p orbitals: Answer: | | 3p 3s