The exception in chromium's electron configuration arises because of stabilization of which arrangement?

The exception in chromium's electron configuration arises because of stabilization of which arrangement?

• A. A fully filled 3d subshell.
• B. A more stable half-filled 3d subshell and reduced electron–electron repulsion.
• C. Maximum 4s occupancy.
• D. No real exception exists.

Answer: (B)