Electronic distribution
1s2
2s2
2p6
3s2
3p6
4s2
3d10
4p6
5s2
4d10
5p6
6s2
4f14
5d10
6p6
7s2
5f14
6d10
7p6
The Linus Pauling diagram shows the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p, 4s...), following the diagonal arrows. It explains how electrons occupy energy levels and sublevels in the ground state, in accordance with the Aufbau principle, Pauli exclusion, and Hund’s rule.