Using Hund's rule, what is the electron configuration for nitrogen (atomic number 7)?

• A. 1s² 2s² 2p⁴
• B. 1s² 2s² 2p³
• C. 1s² 2s² 2p² 3s¹
• D. 1s² 2s¹ 2p⁴

Answer: (B)