2. Atoms and the Periodic Table
The Electron Configuration (Simplified)
Identify the rule (aufbau principle, Hund's rule, Pauli-Exclusion principle) violated by the following electron configurations.
i) Li 1s2 2p1
ii) O [He] 2s2 2p ↿↿ ↿ ↿
iii) P [Ne] 3s2 3p ↿⇂ ↿