Consider the electron filling diagram
3p ↑↓ ↑↓
3s ↑↓
2p ↑↓ ↑↓ ↑↓
2s ↑
1s ↑↓
Which of the following
I) the aufbau principle;
II) the Pauli exclusion principle;
III) Hund’s rule
does it violate?