CHEMISTRY COMMUNITY

Should Ti's electron configuration be [Ar]3d^2 4s^2 or [Ar]4s^2 3d^2? Why?

The electron configuration for Titanium should be [Ar] 3d^2 4s^2 because the 3d orbital has a lower energy level when the electrons enter the 3d orbital so the 3d would be written before the 4s in this situation.